src/vs/workbench/contrib/codeEditor/browser/toggleMultiCursorModifier.ts/ToggleMultiCursorModifierAction/run
class ToggleMultiCursorModifierAction:	override run(accessor: ServicesAccessor): Promise<void> {
		const configurationService = accessor.get(IConfigurationService);

		const editorConf = configurationService.getValue<{ multiCursorModifier: 'ctrlCmd' | 'alt' }>('editor');
		const newValue: 'ctrlCmd' | 'alt' = (editorConf.multiCursorModifier === 'ctrlCmd' ? 'alt' : 'ctrlCmd');

		return configurationService.updateValue(ToggleMultiCursorModifierAction.multiCursorModifierConfigurationKey, newValue);
	}