src/vs/editor/browser/widget/diffEditorWidget.ts/DiffEditorWidgetSideBySide/setEnableSplitViewResizing
class DiffEditorWidgetSideBySide:	public setEnableSplitViewResizing(enableSplitViewResizing: boolean): void {
		const newDisableSash = (enableSplitViewResizing === false);
		if (this._disableSash !== newDisableSash) {
			this._disableSash = newDisableSash;
			this._sash.state = this._disableSash ? SashState.Disabled : SashState.Enabled;
		}
	}