Apply feedback from @Therzok

Remove redundant code, and use a more efficient
overflow removal (even though it should never
be needed)

This is needed because mdtool sets it, and then TestRunner needs to re-set it to an XwtSynchronizationContext.

When cleared by a new monitor, it was possible to clear a BeginTask
message from the pad's queue while the corresponding EndTask message
was still going through the sync context. When executed, the EndTask
message would crash as the indent stack was empty.

Fix this by introducing a cookie. When the cookie no longer matches,
messages are discarded.

This can be used by builds to distinguish between a standalone
build and a build that is being performed as a prerequisite for
execution.

Improve clipboard ring display in toolbox

Fix VSTS 669803: using vstool with Razor

DefaultAutoInsertBracketHandler was conflicting with BraceCompletion for JS/TS.
Turn it off for JS and TS mime types to let BraceCompletion do its job.

[master] Fix VSTS 677075: JS triple \u0022\u0022 inserted instead of two

Fix VSTS 673077: JS: incorrect line break/smart indent on ENTER

…in the IDE

Fixes issue mono#5856 NullRef in SyntaxHighlighting.cs

Allowing it to be 64bit on mac

Fixes VSTS #681973 - MSBuildBuilder.exe is being run as 32bit

Fixes issue mono#5873 Exception when using syntax highlighting in VS for

vb.net by Visual Studio Community 2017 for Mac

https://devdiv.visualstudio.com/DevDiv/_workitems/edit/668301

Basically using the former roslyn classification highlighting (latest
version). However the vb.net loading gets implemented in our workspace
system so the old hack could go away.
Switching to tag based highlighting should work when the
editorfeatures.vbnet dll can be added to our mef composition. But for
now that re-enables vb.net coloring.

…ual Studio Community 2017 for Mac

node helper method.

Fixes VSTS #677558 - Refactoring Contextual Menu Changes

Solution" / "Scrolling over search results" observing ~9 seconds delay

https://devdiv.visualstudio.com/DevDiv/_workitems/edit/672522

Fixes VSTS Bug 668301: [Feedback] Unable to change font colors for

Add missing main toolbar tooltips

[Ide] Track unhandled exceptions

…log-cancel

[Ide][a11y] Fix Cancel button label in new project dialog

[Telemetry] Add the correct StartupType values for the startup event

If no projects were pinned on the welcome page when the IDE started,
pinning a project, then closing and re-opening the IDE, would result
in the project not being pinned on the welcome page. The problem
was that when there was no existing list of pinned projects stored
in the properties file a new list would be used as a default value.
On saving since the list object matched the default value it was
not saved in the properties file. To avoid this only value types,
strings and instances of the Properties class are supported as
default values.

Fixes VSTS #692381 - Pinned projects are no longer remaining pinned
after a restart

Fixes VSTS #692948

[DotNetCore] Add support for .NET Core 2.2

Improve shift-tab experience in the toolbar

Fixes issue mono#6104 Invalid URI exception on opening file in root

Fixes issue mono#6089 StackOverflow on running unit tests

[Telemetry] Fix null reference when opening solutions from finder

soft-selected

Fixes issue mono#6142 Completion still commits on ENTER when an item is

Report _from_ version in addition to _to_ version

fixes VSTS #694766

Use a separate timer so that the total duration is reported correctly

Fix NRE when getting ConfigurationSelector

[Telemetry] Don't reset the startup timer

Also check that drag node is not the same as drop node.

Fixes VSTS #694596

[F#] Fix CanDropNode so that it only works within F# projects