src/vs/workbench/contrib/terminal/browser/terminalTabbedView.ts/TerminalTabbedView/_handleOnDidSashChange
class TerminalTabbedView:	private _handleOnDidSashChange(): void {
		const listWidth = this._splitView.getViewSize(this._tabTreeIndex);
		if (!this._width || listWidth <= 0) {
			return;
		}
		this._updateListWidth(listWidth);
	}