src/vs/workbench/contrib/terminal/browser/xterm/decorationAddon.ts/DecorationAddon/_disposeAllDecorations
class DecorationAddon:	private _disposeAllDecorations(): void {
		this._placeholderDecoration?.dispose();
		for (const value of this._decorations.values()) {
			value.decoration.dispose();
			dispose(value.disposables);
		}
	}