v0.14.0-alpha+1

Component Updates

Application Layout

• Add canClose input to the temporary drawer to prevent the drawer from
  toggling.

Dynamic Component

• Use type promotion instead of dynamic dispatch to update a RendersValue
  instance.
• Change to "OnPush" change detection.

Material Auto Suggest Input

• Stop event propagation when key nav events are handled.
• Update to work within components using ChangeDetectionStrategy.OnPush.

Material Button

• Add Sass mixins to change the padding on the internal button content, adjust
  vertical alignment, and reset text-transform.
• Remove Sass mixin button-text-capitalize().
• Fix visibility in Microsoft Edge on Windows when using High Contrast mode.

Material Datepicker

• Add Sass mixins for margins around and between the next and previous buttons.
• Increase the color ratio for the apply/cancel buttons.
• Allow picking times using specified increments.
• Handle <ESC> key press when picker is visible.
• Removed deprecated comparesToPreviousPeriod() and
  comparesToSamePeriodLastYear().
• Delegate to FocusItemDirective.
• Fix the a11y role for the date range preset list.
• Improved accessibility for presets.

Material Dialog

• Add Sass mixin for the footer margin.
• Always keep a transparent scroll stroke to prevent dialog from shifting.

Material Expansion Panel

• Improve accessibility.
• Accommodate contents taller than the screen size.

Material Input

• Make text size limits available to screen readers.
• Change attribute inputRole to and input role.
• Add a CSS class .ltr so input can set direction: ltr on the top section.
• Add Sass mixin to adjust the location of floating label.

Material Menu

• Prevent screen readers from reading a non-collapsible label as "button".
• Apply the same background color on focused and active items.
• Update icon attribute to use a Dart boolean instead of a string 'true'.
• Add Sass mixin for adding ellipsis to overflowing item text.
• Auto-activate FAB menu items when a screen reader triggers the fab.
• Only auto focus an active item when it exists.
• Protect against null pointer exception when closing.
• Move focus-trap outside of the menu-item-groups.
• Add a way to pass context to the MenuItem actions.

Material Popup

• Add ariaLabel input.
• Encapsulate the popup class name.

Material Select

• Fix selected item visibility in Microsoft Edge on Windows when using High
  Contrast mode.
• Add Sass mixins for adding ellipsis to overflowing item text and a custom
  outline.

Material Slider

• Support two sided sliders.

Material Stepper

• Add yesText input.
• Add input to keep inactive steps in DOM.
• Add partially complete state.
• Update icon and index colors for improved a11y.

Material Tab

• Set tabbable tab to always be activeTab.
• Improve allow-text-wrap Sass mixin.
• Rename Sass mixin allow-text-wrap to tab-text-wrap and default
  $break-word to true.
• Add Sass mixin to apply text transform.

Material Tooltip

• Fix deferred content within tooltip.
• Add Sass mixin for paper tool tips with multiple sections.

Material Tree

• Add input to toggle selection of non-leaf nodes.

Other Updates

Miscellaneous

• Remove mat-icon-image() in favor of inline-image().
• Add subtract() to Date model.
• Migrate event handlers with multiple statements to component methods.
• Fix violations of the strict_raw_types analysis option.
• Fix violations of prefer_initializing_formals, prefer_collection_literals,
  and prefer_final_fields lints.
• Properly remove items when invoking StickyContainerLayout.remove().
• Create mixins for error_panel.
• General code readability fixes.
• Deprecate outdated Sass mixins: button-bar-layout(), mat-input-header(),
  clear-button(), icon-background(), cursor-grab(), and
  cursor-grabbing().
• Fix graphical issue with sticky elements with height: 0.
• Add option to disable GestureListener in ScrollHost.
• Rename palette.dart to material_chart_colors.dart.

Documentation

• Minor documentation fixes.

v0.13.0+1

Maintenance Release

Update dependencies to support building with a globally activated version of
webdev: ^2.0.6.

v0.14.0-alpha

Component Updates

Material Auto Suggest Input

• Adding generic type to factoryRenderers in items.
• Update blur event logic.
• Add inputAutocomplete input.
• Improve a11y with added aria controls.

Material Checkbox

• Add Sass mixin to remove all margins.

Material Date Picker

• Fix issue where given dateFormat was not used to decode the input value.
• Apply FocusableMixin.
• Modularize and deprecate timeZoneAwareDatepickerProviders.
• Prevent wordwrap for the range title.

Material Dialog

• Add Sass mixin to justify footer content.

Material Dropdown Select

• Pass aria-describedby through to the dropdown button.

Material Expansion Panel

• Only auto focus a child, when the panel is expanded.
• Only fire events and DOM changes on on-target TransitionEnd events.
• Improve a11y by toggling content visibility when the panel expands or
  collapses.
• Add focusOnOpen input.

Material Input

• Add Sass mixin to change bottom section width and trailing text.
• Add inputAriaControls input.

Material Menu

• Add popupClass and buttonAriaLabelledBy inputs.
• Add Sass mixin to configure the background color of a selected menu item.

Material Popup

• Fix memory leak.

Material Radio

• Ensure changes are picked up by Angular's change detection.
• Add Sass mixin to configure the content margin.
• Fix issue where programmatic changes to the value model were not shown.

Material Select

• Adding generic type to factoryRenderers in items.
• Add Sass mixins to configure item colors.

Material Stepper

• Fix an issue where when activeStepIndex is set to a value but the step state
  is not updated accordingly.

Material Tab

• Loop items and ignore up and down arrow key presses when focusing.

Material Tooltip

• Add Sass mixin to configure the max width of a tooltip.
• Improve a11y with focus control.

Material Tree

• Properly apply nested-material-tree-item-style Sass mixin to nested items.
• Introduce a allowDeselectInHierarchy configuration that allows clients to
  specify if a user should be allowed to deselect an option that they have
  already selected (by clicking on it again).

Material Yes/No Buttons

• Make EnterAcceptsDirective use key press instead of key up to align with
  button decorator.
• Added aria-describedby.

Scorecard

• Only apply tabindex 0 to scorecards that are selectable.

Other Updates

Selection Model

• Change SelectionModel.isSingleSelect from a field to an abstract getter.
• Add a missing super.dispose() call to _StreamSelectionOptions

Miscellaneous

• Improve OverlayService singleton error message.
• Modularize ruler bindings.
• Fix a bug where scroll host would try to add events to a closed
  StreamController.
• Update FocusItemDirective and FocusListDirective to work consistently
  under OnPush components.
• Use GPU accelerated CSS translate rather than 2D translate in sticky
  controller.
• Make the new trigger logic the default for popups. This ignores drag mouse up
  calls to that users can more easily select text in popups.
• Mark DeferredContentDirective for change detection, after handling event
  from deferred content aware parent.
• Fix a scroll host issue where scroll events were not ignored when the Meta
  key was pressed.
• Cleanup uses of deprecated getBool().
• Replace uses of detectChanges() with runAfterChanges....
• Add generic type argument to AcxImperativeViewUtils.insertComponent<T>().
• Add the ability to ignore up and down keys (for moving focus around within
  children) when using the focus list.
• Update all components to use ref="noopener noreferrer" for target="_blank"
  links.

Documentation

• Minor documentation fixes.

v0.13.0

Component Updates

Material Autosuggest Input

• Toggle multi-select items with <Space> instead of <Enter>.
• Make the pointer for the clear icon consistent with other buttons when
  disabled.

Material Button

• Apply media query to _button_hover mixin call so that we will skip hover for
  all touchscreens (only apply hover for media supporting hover).
• Add Sass mixins to customize icon colors and left align button text.
• Avoid double trigger of button with a space bar keypress.

Material Checkbox

• Use both label and content as aria label.
• Add types to the outputs.

Material Date Picker

• Make the calendar component invisible to screen readers.
• Add selectDatePlaceHolderMsg, placeholderMsg, and
  dropdownButtonAriaLabel inputs.

Material Date Range Picker

• Add preferredPositions input.
• Improve handling of pt-BR date range formatting to remove repetitive "de"s
  when the endpoints fall into different years.
• Make comparison toggle label clickable.

Material Dialog

• Add Sass mixin to customize font size.
• Use header as default dialog label.
• Mark current landmarks as role="presentation" to avoid unnecessary grouping.
• Add missing modal visible output.

Material Expansion Panel

• Add missing modal visible output.
• Allow header to have an outline, and control it with keyboard only focus.
• Add aria-expanded to announce when it is opened/closed.
• Add Sass mixin to make save button raised and highlighted.
• Improve a11y.
• Add the ability to tag the content that you would like to focus when an
  expansion panel opens.

Material Icon

• Add Sass mixin to customize svg icon size.

Material Input

• Update error message for negative percentage value to be "not negative"
  instead of "positive", because zero is allowed.
• Ensure that aria-disabled is set for the input when the input is disabled.
• Use aria-describedby attribute in the to call out errors.
• Remove TAB focus from disabled multiline input.
• Add Sass mixin for multiline inputs to flex and scroll the text entry.
• Add Sass mixins for setting flex-grow property and the clear icon color.
• Stop hiding character counter from Aria.
• Add role="alert" to error text region.
• Add generic types to MaterialInputDefaultValueAccessor and
  MaterialNumberValueAccessor.
• Create new Int64 value accessor.
• Pass down the aria-label for leading and trailing glyphs.

Material Menu

• Remove unnecessary escape key handling in MenuItemGroupsComponent.
• Add in aria-label support into the items and groups.
• Open dropdown when navigation keys are pressed.
• Add Sass mixin to customize the item icon size.
• Add aria-expanded to collapsible menu groups.
• Fix item focus bug when the fab menu is opened.
• Improve aria roles for MenuItemGroup items.
• Add keyboard accessibility functionality for active item handling.

Material Progress

• Fix screen reader status messages.

Material Popup

• Add autoDismissBlockers input to block click events in certain elements from
  closing the popup.
• Support defining custom boundaries around window viewport.
• Ensure footer stays inside popup boundaries.
• Add Sass mixin to override overflow value.
• Fix memory leaks.

Material Stepper

• Announce the current step via the screen reader.
• Provide custom aria label for steps.

Material Select

• Fix issue where a keypress on selected item would re-open dropdown.
• Remove tabIndex from items and let the dropdown control focus instead. Focus
  is now controlled by the dropdown itself.
• Support keyboard navigation.
• Add Sass mixins to customize:
  • Background color of the selected item.
  • Minimum height of the dropdown buttons.
  • Color of the dropdown icon.
  • Font size of items.
• Allow auto-focusing on the active item.
• Update Sass mixin dropdown-icon-spacing to accept all four margins.

Material Tab

• Add Sass mixin to customize tab strip elevation.

Material Toggle

• Add focus effect.

Material Tooltip

• Remove initAriaAttributes for ink tooltips by default.
• Fix hiding tooltip for MaterialTooltipTargetDirective when focusing inside
  of it.

Material Tree

• Add allowParentSingleSelection input.
• Don't override state when expandAll hasn't been set.
• Add component generics and pass type through to nodes.

Material Yes/No Buttons

• Add Sass mixin to make yes button raised and highlighted.
• Add Sass mixin to make no button highlighted.

Scorecard

• Fix improper heading hierarchy.
• Fixed scrolling when the average size of the cards is bigger than the client.

Simple HTML Component

• Add attribute doNotVerifyUrlDestinations to allow "normal" external URLs.

Other Updates

Selection Model

• Allow is NullSelectionModel as a replacement for
  == const SelectionModel.empty(), necessary for typed selection models which
  can't use const.
• Expose null selection model type to allow type checks.
• Remove deprecated SelectionModel().
• Add isSingleSelect field.

Miscellaneous

• Allow HasTabIndex to not set a TabIndex.
• Fix a bug where sticky elements do not stack when sticky position is BOTTOM.
• Use named providers instead of the soft deprecated provide(...) and
  Provider(...).
• Update MDC Web styles to v1.1.0
• Tighten public APIs with @visibleForTemplate.
• Enable trigger logic that only considers mouseup events as part of
  triggersOutside() if the corresponding mousedown event came from the same
  element.
• Fix runtime cast errors.
• Remove use of ChangeDetectionStrategy.Detached.
• Non-tabbable buttonDirectivesRemove now have no tabIndex instead of -1.
• Many components migrated to OnPush change detection.

v0.12.0

Component Updates

Material Auto-Suggest Input

• Disable clear icon when the input is disabled.
• Hide an empty suggestion group.

Material Button

• Add Sass mixin to change the color of a disabled button.

Material Card

• Update elevation appearance to match spec.

Material Chips

• Allow setting a custom aria label for the delete button.
• Fix issue that prevented removing chips while using JAWS screen reader.
• Add Sass mixins for font-weight and padding.

Material Datepicker

• Remove globalDateRangeBindings.
• Allow setting a custom aria label to the dropdown button.
• Allow passing custom DateFormat from the material-date-range-picker to the
  date-range-input.

Material Dialog

• Allow setting a custom aria label and describe by.

Material Expansion Panel

• Ensure height calculations are completed after the main content is destroyed.
• Fix keyboard controls to prevent focusing a hidden header button.
• Allow setting a custom aria label to the panel.
• Make the entire content of the panel deferred rather than just the buttons.
• Make the expansion button not be tabbable since the heading is tabbable.
• Prevent hidden buttons from being focused in the header.
• Improve panel resizing.
• Implement focusableItem so that it can work with a focusList.
• Move name ng-content above the input name and description.

Material Icon

• Correctly stretch SVG icon.
• Remove aria label from the icon.

Material Input

• Add Sass mixin for label text vertical-align.
• 'percent' is an invalid type attribute, 'text' instead.
• If the multi-line input is not currently in the DOM listen to DOM updates
  until the line height can be read.
• Ensure only whitespace is considered an invalid number input.
• Allow specifying an aria described by id on the input.
• Add Sass mixin to center align text.
• Hide place holder on input field from screen reader.
• Fix focus behavior in disabled state.

Material List

• Change the default roles to list and listitem.

Material Menu

• Create standalone menu item affix components.
• Load standalone menu item affix components via DynamicComponent instead of
  using NgIfs.
• Allow described by id to be specified for a dropdown button.
• Create MenuItemMixin.

Material Month Picker

• Re-render highlights when view is reset.

Material Popup

• Move the overlay focus placeholder elements inside of Material Popup.
• Enable OnPush change detection.

Material Ripple

• Remove ripple elements when component is destroyed.

Material Select

• Support custom aria handling for each list item in dropdown.
• Support OnPush change detection.
• Revert change that attempted to fix strange behavior when mixing keyboard and
  mouse input because it broke some keyboard navigation.
• Allow setting a custom aria label and describe by.
• Add Sass mixin to customize dropdown item selected background color.

Material Tab

• Add Sass mixin to make the tab contents display: block.

Material Time Picker

• Fix regression where time cannot be set by user a programmatic change.

Material Tooltip

• initPopupAriaAttributes is now passed through to all the tooltip variations.
• Restore any previously defined aria-describedby value, after popup closes.
• Add Sass mixin to set word-break.
• Fix nested tooltip targets preventing tooltips from staying open when hovered.

Material Tree

• Add ability to specify a label renderer for dropdown button text.
• Add ability to style items in the tree dropdown.

Material Yes/No Buttons

• Add optional ARIA label inputs.
• Add Sass mixin to remove the margin-left.
• Add autofocus functionality for use in confirmation dialogs.

Scorecard

• Vertically align the change glyph to the middle.

Simple HTML Component

• Allow 'class' attribute for all elements.

Miscellaneous

• Add home/end key modifiers to focus_list to focus the first or last value.
• Remove $mat-gray as an alias for $mat-grey in Sass mixins.
• Add shouldFilterEmpty parameter to StringSelectionOptions to return empty
  filtered values when query is empty.
• Make the role of a button mutable, after initialization.
• Update MDC Web styles to v0.44.0.
• Add HtmlDocument in addition to Document as a provided windowBinding.
• Modularize clock bindings.
• Remove default values for optional parameters on notifySelectionChange().
• Use WheelEvent instead of MouseEvent in scroll host.
• Fix previously uncaught violations of invalid override method parameter
  default values.

Documentation

• Minor docs fixes.

v0.11.0

New Component

• Simple HTML Component.

Component Updates

Material Chips

• Add a focused style to delete icon.
• Remove default value from $max-chip-width in the material-chip-max-width
  Sass mixin.
• Remove material-chips-margin Sass mixin.

Material Date Range Picker

• Make dropdown not tabbable so it can be opened using the top level button
  decorator.
• Add NextNDaysFromToday class.
• Auto scroll to the bottom when comparison is turned on by the user.
• Fix constrained sizing on Firefox browser.
• Make intl messages final.

Material Dialog

• Fix size of full screen dialog.
• Close parent modal on escape key by default.

Material Icon

• Add MaterialIconToggleDirective to allow for an icon with two states.

Material Input

• Update the integer error message per Editorial feedback.
• Add Sass mixin for changing the color of the counter.
• Fix a11y when there is a labeledby id and a aria label specified.

Material Menu

• Add a drop-in replacement for secondaryIcon - itemSuffix that removes the
  boilerplate of creating an observable list for a single element.
• Automatically expand a collapsed category when keyboard navigating to a child
  item.
• Remove usages of secondary icon and related fields/methods from menu item
  model.
• Prevent refocus on a menu item when the menu is closing.
• Add isTabbable to MenuItemComponent.
• Improve a11y in Material Fab Menu.
• Fix focus target when pressing Up Arrow key.

Material Popup

• Correctly restore focus in nested popups.

Material Select

• Add type parameters on BaseDropdownSelectValueAccessor and subclasses.
• Set max-width to 100% on dynamic-item.
• Removing Sass mixin for setting the width of the container element in
  dropdowns with factoryRenderers to 100%, as this was adopted as the standard.
• Use the generic type parameter from MaterialDropdownSelectComponent on the
  ActivateItemOnKeyPressMixin.
• Fix focus bugs when mixing keyboard and mouse navigation.
• Add temporary fix for scrolling bug in Chrome browser.
• Fix MaterialDropdownSelect type error when clicking a deselect item.
• Fix the type of itemRenderer in MaterialDropdownSelectComponent.

Material Tabs

• Make default width of tab-content to 100%.

Material Tooltip

• Improve a11y and keyboard navigation.
• Fix removing describe-by.

Modal/Overlay

• Add ability to create an accessible overlay container for clients that
  currently provide custom overlay container.
• Fix selector of PopupSizeProviderDirective.
• Restore focus to popup source element if the popup is closed via keyboard from
  inside itself.
• Close popup on escape if the focus is inside the popup or on the popup source
  element.

Miscellaneous

• Improve error message when selection type is wrong in SelectionInputAdapter.
• Add primaryStyle to StyleFormatter.
• Refactor the keyboard only focus indicator so that when an element is focused
  programmatically it will obey the focus state of the last known interaction.
• Only consider mouseup events as part of triggersOutside() if the
  corresponding mousedown event came from the same element.
• Set attached portals on portals attached to DomPortalHosts
• Fix focus issues with modal dialogs.
• Add FocusIndicatorController for use in debug environments.

Documentation

• Minor docs fixes.

v0.10.1

Component Updates

Material Chips

• Improve support for generics.
• Stop setting popup attributes as those attributes are set on the input
  directly.
• Only set the aria-owns property and inputAriaActivedescendent when the
  popup is open.
• Add Sass mixin to allow text wrapping.

Material Date Picker

• Use PopupSizeProvider to control the height of the picker.
• Add rangeFormatter input to the range picker.

Material Expansion Panel

• Improve accessibility.
• Smooth expansion/collapse animations when headers are hidden.

Material Icon

• Add Sass mixin to use an SVG for an icon instead of the standard font icons.

Material Input

• Add Sass mixins to disable wrapping for hint text and hide leading and
  trailing text.
• Fix MaterialPercentInputDirective for LTR languages with leading % symbol.
• Fix inconsistent margins in Safari browser.

Material Menu

• Add ability to provide extra label annotations for menu items.

Material Select

• Add Sass mixins to restrict item width, font size, line height, and padding.
• Added generics support.
• Add activateFirstOption input.

Material Slider

• No longer focusable when disabled.

Material Stepper

• Ensure items that can't be selected also can't be tabbed to.

Material Tab

• Add Sass mixin for a shadow below the tab strip.

Material Tree

• Add a dynamic content to accommodate custom elements.

Material Toggle

• Update the theme Sass mixin to include a grey color when the toggle is
  disabled.

Material Tooltip

• Add Sass mixins to control padding, and max height.

Material Yes/No Buttons

• Allow No button to be disabled.

Modal/Overlay

• Add null guard check to event.
• A11y improvements.
• Attempt to restore focus when modal closes.

Miscellaneous

• Update MDC Web styles to v0.40.0.
• Improved support for generics in HighlightAssistant.
• Handle unsupported WheelEvent.deltaX in scroll host.
• Update scroll host support on iOS.
• Allow dropdown components to contain an auto_focus directive.

Documentation

• Minor docs fixes.

v0.10.0

Component Updates

Material Auto Suggest Input

• Rename shouldClearOnSelection to shouldClearInputOnSelection.
• Improve keyboard navigation after mouse interactions in the popup.
• Only allow deselection via in multi-selection mode in material auto suggest
  input.
• Disallow selecting disabled options via keyboard.
• Remove deprecated suggestions and sorted inputs.
• Update to support generics.

Material Button

• Mark certain fields as visibleForTemplate and drop the copied value where
  not needed.

Material Chips

• Add Sass mixins to adjust border and font size of a single chip and border
  padding, and background color, border, and padding of a set of chips.

Material Expansion Panel

• Wrap the buttons in a defferredContent directive. This is to help
  accessibility and have those buttons not be available for screen readers.

Material Input

• Fix bug in MaterialNumberValueAccessor where null value won't clear previous
  input.

Material Dropdown Select

• Provide the simplified selection and options inputs. Pull the common logic
  into SelectionInputAdapter mixin class.
• Migrate ComponentRenderer to FactoryRenderer.
• Disallow selecting disabled options via keyboard.
• Highlight disabled items when activated via keyboard.

Material Menu

• Add a secondary-label field. The appearance of this label is subject to minor
  changes in the near future as the UX is still experimental.
• Properly use the sub-menu's width, not the parent menu's width, to determine
  the width of the menu.

Material Radio

• Tighten down the public API surface of the radio component by marking many of
  them as visibleForTemplate.

Material Select Searchbox

• Add in null pointer protection when input is set without a filterable.

Modal/Overlay

• Enable useMultiModalDismissal by default.

Miscellaneous

• Use typed provider for location providers.
• Also corrected the type signature of runOutsideAngular, which in turn may
  enable hint-level warnings by the analyzer. Users may be impacted if they fail
  the build on hints.
• Add StickyController.onUpdate, a stream which fires events immediately after
  StickyController writes to the DOM, and expose it as an output on
  ElementScrollHost.
• Trigger the sticky controller sync on scrollToPosition calls.

Documentation

• Add new readme for Material Dropdown Select.
• Minor docs fixes.

v0.9.2

Component Updates

Material Auto Suggest Input

• Implement HasDisabled.
• Allow selection input to take selected value for single selection in
  addition to SelectionModel.
• Expose selection output to emit selected value(s) on selection changes.
• Add shouldClearSelectionOnInput input.

Material Button

• Remove unused hover-color argument from button color Sass mixins.

Material Datepicker

• Add Sass mixins for rendering the range title to the left of the dropdown
  component and for removing some padding to save vertical space.
• Harden DatepickerComparison.comparesTo() against nulls.

Material Expansion Panel

• Add transition to save/cancel collapse.
• Add Sass mixin for custom box-shadow.

Material Input

• Add Sass mixin to set the bottom section margins.
• Allow MaterialPercentInputDirective to follow NumberFormat specification
  for percent.
• Allow selectionOptions input to accept a List in addition to
  SelectionOptions.

Material Menu

• Remove Sass mixin material-fab-menu-icon-size.

Material Tooltip

• Change the ink tooltip stay open if the mouse is currently in it's bounds.

Material Tree

• Allows dropdown component to accept custom popup positions.
• Fix off-center alignment issue between radio button and text in
  MaterialTreeGroupFlatRadioComponent.

Scorecard

• Expose ScorecardBarDirective so it can be resued by other card bar
  implementations.

Miscellaneous

• Improvements to StickyController for the single-stickyKey case: Add
  enableSmoothPushing setting, and partially support stickyKey'd elements of
  differing heights.
• Replace all deprecated Material typography variables/mixins with their
  canonical versions, and inline mixins with no replacement.
• Fix unawaited_futures lint warnings by adding missing awaits.

Documentation

• Add new readme for Material Auto-suggest Input.
• Minor docs fixes.

v0.9.1

Component Updates

Material Date Range Picker

• Add an option to disable maintaining the length of the date range when
  clicking on the calendar to move the start date.

Material Expansion Panel

• Add Sass mixin for border radius.
• Only register immediate child panels in a panel set.
• Add listener for expand change to fix bug where an expansion panel set would
  not recognize a programmatically pre-expanded panel.

Material Select

• Add Sass mixin for the selected item color.

Material Stepper

• Add Sass mixins for the step name color.

Material Toolip

• Add Sass mixin to set the card tooltip max width.
• Add an icon attribute to specify any icon by name.
• Add positioning options on icon tooltip.

Selection Options

• Add interface to segment options into option groups.

Miscellaneous

• Fix ActiveItemDirective's scroll into view functionality in popups and
  modals.
• Add ObservableView.firstNonNull and ObservableView.nonNullValues.
• Update MDC Web styles to v0.38.0.
• Fix missing return errors.
• Fix default line-height values to match MDC versions.

Documentation

• Minor doc fixes.
• Cleanup some docs for with optional new/const.