src/vs/workbench/contrib/preferences/browser/keybindingsEditor.ts/KeybindingsEditor/defineWhenExpression
class KeybindingsEditor:	defineWhenExpression(keybindingEntry: IKeybindingItemEntry): void {
		if (keybindingEntry.keybindingItem.keybinding) {
			this.selectEntry(keybindingEntry);
			this._onDefineWhenExpression.fire(keybindingEntry);
		}
	}