src/vs/workbench/contrib/scm/browser/scmViewPane.ts/InputRenderer/getFocusedInput
class InputRenderer:	getFocusedInput(): ISCMInput | undefined {
		for (const [input, inputWidget] of this.inputWidgets) {
			if (inputWidget.hasFocus()) {
				return input;
			}
		}

		return undefined;
	}