DVF-2643 default tooltip formatting and linter updated to 2.3.19

Author: chernetsky

src/vector/Element.js

@@ -483,7 +483,7 @@ acgraph.vector.Element.prototype.getFullChildrenCount = function() {
 
 /**
  * Gets/sets element's title value.
- * @param {(string|null)=} opt_value - Value to be set.
+ * @param {?string=} opt_value - Value to be set.
  * @return {(string|null|acgraph.vector.Element|undefined)} - Current value or itself for method chaining.
  */
 acgraph.vector.Element.prototype.title = function(opt_value) {
@@ -500,7 +500,7 @@ acgraph.vector.Element.prototype.title = function(opt_value) {
 
 /**
  * Gets/sets element's desc value.
- * @param {(string|null)=} opt_value - Value to be set.
+ * @param {?string=} opt_value - Value to be set.
  * @return {(string|null|acgraph.vector.Element|undefined)} - Current value or itself for method chaining.
  */
 acgraph.vector.Element.prototype.desc = function(opt_value) {

src/vector/Stage.js

@@ -2247,7 +2247,7 @@ acgraph.vector.Stage.prototype.childClipChanged = goog.nullFunction;
 
 /**
  * Gets/sets element's title value.
- * @param {(string|null)=} opt_value - Value to be set.
+ * @param {?string=} opt_value - Value to be set.
  * @return {(string|null|!acgraph.vector.Stage|undefined)} - Current value or itself for method chaining.
  */
 acgraph.vector.Stage.prototype.title = function(opt_value) {
@@ -2265,7 +2265,7 @@ acgraph.vector.Stage.prototype.title = function(opt_value) {
 
 /**
  * Gets/sets element's desc value.
- * @param {(string|null)=} opt_value - Value to be set.
+ * @param {?string=} opt_value - Value to be set.
  * @return {(string|null|!acgraph.vector.Stage|undefined)} - Current value or itself for method chaining.
  */
 acgraph.vector.Stage.prototype.desc = function(opt_value) {

src/vector/svg/Renderer.js

@@ -328,7 +328,7 @@ acgraph.vector.svg.Renderer.prototype.isImageLoading = function() {
 /**
  * Serializes a given Path and converts its data to a String which can be used in SVG.
  * @param {acgraph.vector.PathBase} path The Path to serialize.
- * @return {(string|null)} A representation which can be used in SVG.
+ * @return {?string} A representation which can be used in SVG.
  * @private
  */
 acgraph.vector.svg.Renderer.prototype.getSvgPath_ = function(path) {

src/vector/vml/Renderer.js

@@ -595,7 +595,7 @@ acgraph.vector.vml.Renderer.prototype.setPositionAndSize_ = function(element, x,
  * Serializes Path and converts it into string that can be used in VML.
  * @param {acgraph.vector.PathBase} path Path.
  * @param {boolean=} opt_transformed Use transformed instead of original.
- * @return {(string|null)} VML acceptable path.
+ * @return {?string} VML acceptable path.
  * @private
  */
 acgraph.vector.vml.Renderer.prototype.getVmlPath_ = function(path, opt_transformed) {