doing optimization

Author: aiday-mar

src/vs/editor/contrib/stickyScroll/browser/stickyScrollWidget.ts

@@ -21,6 +21,12 @@ export class StickyScrollWidgetState {
 		readonly lineNumbers: number[],
 		readonly lastLineRelativePosition: number
 	) { }
+
+	public equals(other: StickyScrollWidgetState | undefined): boolean {
+		return !!other && this.lastLineRelativePosition === other.lastLineRelativePosition
+			&& this.lineNumbers.length === other.lineNumbers.length
+			&& this.lineNumbers.every((lineNumber, index) => lineNumber === other.lineNumbers[index]);
+	}
 }
 
 const _ttPolicy = createTrustedTypesPolicy('stickyScrollViewLayer', { createHTML: value => value });
@@ -35,6 +41,7 @@ export class StickyScrollWidget extends Disposable implements IOverlayWidget {
 	private _lastLineRelativePosition: number = 0;
 	private _hoverOnLine: number = -1;
 	private _hoverOnColumn: number = -1;
+	private _state: StickyScrollWidgetState | undefined;
 
 	constructor(
 		private readonly _editor: ICodeEditor
@@ -68,6 +75,10 @@ export class StickyScrollWidget extends Disposable implements IOverlayWidget {
 	}
 
 	setState(state: StickyScrollWidgetState): void {
+		if (state.equals(this._state)) {
+			return;
+		}
+		this._state = state;
 		dom.clearNode(this._rootDomNode);
 		this._disposableStore.clear();
 		this._lineNumbers.length = 0;