src/vs/workbench/services/keybinding/common/keybindingEditing.ts/KeybindingsEditingService/findUnassignedDefaultKeybindingEntryIndex
class KeybindingsEditingService:	private findUnassignedDefaultKeybindingEntryIndex(keybindingItem: ResolvedKeybindingItem, userKeybindingEntries: IUserFriendlyKeybinding[]): number[] {
		const indices: number[] = [];
		for (let index = 0; index < userKeybindingEntries.length; index++) {
			if (userKeybindingEntries[index].command === `-${keybindingItem.command}`) {
				indices.push(index);
			}
		}
		return indices;
	}