Initial VS Code 1.19 source merge (#571)

* Initial 1.19 xcopy

* Fix yarn build

* Fix numerous build breaks

* Next batch of build break fixes

* More build break fixes

* Runtime breaks

* Additional post merge fixes

* Fix windows setup file

* Fix test failures.

* Update license header blocks to refer to source eula

src/vs/base/browser/ui/scrollbar/abstractScrollbar.ts

@@ -187,10 +187,6 @@ export abstract class AbstractScrollbar extends Widget {
 		}
 	}
 
-	public delegateSliderMouseDown(e: ISimplifiedMouseEvent, onDragFinished: () => void): void {
-		this._sliderMouseDown(e, onDragFinished);
-	}
-
 	private _onMouseDown(e: IMouseEvent): void {
 		let offsetX: number;
 		let offsetY: number;

src/vs/base/browser/ui/scrollbar/scrollableElement.ts

@@ -17,7 +17,7 @@ import { Scrollable, ScrollEvent, ScrollbarVisibility, INewScrollDimensions, ISc
 import { Widget } from 'vs/base/browser/ui/widget';
 import { TimeoutTimer } from 'vs/base/common/async';
 import { FastDomNode, createFastDomNode } from 'vs/base/browser/fastDomNode';
-import { ScrollbarHost, ISimplifiedMouseEvent } from 'vs/base/browser/ui/scrollbar/abstractScrollbar';
+import { ScrollbarHost } from 'vs/base/browser/ui/scrollbar/abstractScrollbar';
 import Event, { Emitter } from 'vs/base/common/event';
 
 const HIDE_TIMEOUT = 500;
@@ -45,7 +45,7 @@ class MouseWheelClassifierItem {
 
 export class MouseWheelClassifier {
 
-	public static INSTANCE = new MouseWheelClassifier();
+	public static readonly INSTANCE = new MouseWheelClassifier();
 
 	private readonly _capacity: number;
 	private _memory: MouseWheelClassifierItem[];
@@ -250,14 +250,6 @@ export abstract class AbstractScrollableElement extends Widget {
 		this._verticalScrollbar.delegateMouseDown(browserEvent);
 	}
 
-	/**
-	 * Delegate a mouse down event to the vertical scrollbar (directly to the slider!).
-	 * This is to help with clicking somewhere else and having the scrollbar react.
-	 */
-	public delegateSliderMouseDown(e: ISimplifiedMouseEvent, onDragFinished: () => void): void {
-		this._verticalScrollbar.delegateSliderMouseDown(e, onDragFinished);
-	}
-
 	public getScrollDimensions(): IScrollDimensions {
 		return this._scrollable.getScrollDimensions();
 	}

src/vs/base/browser/ui/scrollbar/scrollbarState.ts

@@ -189,10 +189,6 @@ export class ScrollbarState {
 		return this._computedSliderPosition;
 	}
 
-	public getSliderCenter(): number {
-		return (this._computedSliderPosition + this._computedSliderSize / 2);
-	}
-
 	/**
 	 * Compute a desired `scrollPosition` such that `offset` ends up in the center of the slider.
 	 * `offset` is based on the same coordinate system as the `sliderPosition`.