Editor GPU: Only re-render lines where decorations change on ViewDecorationsChangedEvent

[Tyriar]

vscode/src/vs/editor/browser/gpu/fullFileRenderStrategy.ts

Lines 302 to 309 in 2833b09

	case ViewEventType.ViewDecorationsChanged: {
	cellBuffer.fill(0);
	dirtyLineStart = 1;
	dirtyLineEnd = Math.max(dirtyLineEnd, this._finalRenderedLine);
	this._finalRenderedLine = 0;
	break;
	}