Repro Steps
1. Open a document.
2. Create a shape.
3. From the Shape settings, click the color swatch to display the color picker.
4. Modify the hex value in the Hex Color field and press Enter to apply it.
5. Press Cmd-Z to Undo. Note that the color change is reverted.
6. Close the color picker.
7. Click the Color Wheel button to display the Colors window.
8. Modify the hex value in the Hex Color field and press Enter to apply it.
9. Press Cmd-Z to Undo. Note that the color change is not reverted.
10. Click elsewhere in the UI so the Hex Color field loses focus.
11. Press Cmd-Z to Undo. Note that the color change is now reverted.
Expected Behavior
Pressing Cmd-Z after changing the Hex Color value should always Undo. Hex Color fields should perform consistently throughout the application.
Actual Behavior
You can't Undo while the Colors window Hex Color field has focus.