Entering and then exiting the Apple IIGS Control Panel in Disk Copy, in the Selector or in desk accessories should not cause the Apple IIGS to remain in color mode and mess up its video

[c0mmander8]

Describe the bug
Entering and then exiting the Apple IIGS Control Panel in Disk Copy, in the Selector or in desk accessories causes the Apple IIGS to remain in color mode and messes up its video.

To Reproduce
Steps to reproduce the behavior:

1. Start Apple II DeskTop or launch the Selector on an Apple IIGS.
2. Launch Disk Copy or open a desk accessory if Apple II DeskTop has been started instead of the Selector being launched.
3. Enter the Apple IIGS Control Panel.
4. Exit the Apple IIGS Control Panel.
5. The Apple IIGS remains in color mode and its video is messed up.

Expected behavior
Entering and then exiting the Apple IIGS Control Panel in Disk Copy, in the Selector or in desk accessories should not cause cause the Apple IIGS to remain in color mode and mess up its video.

Screenshots
I am sorry. I have no screenshots to help explain my problem.

System Details (please complete the following information):

• System [e.g. Apple IIe Enhanced, Apple IIc, Apple IIgs] Apple IIGS (ROM 01)
• Emulator? [e.g. real hardware, or emulator name] GSplus 0.14 (the latest version of the program)
• ProDOS version ProDOS 2.4.2 (the latest version)
• DeskTop version (from About > Apple II DeskTop...) Apple II DeskTop 1.2 Alpha 27 (the latest version of the program)
• Other [e.g. mouse, memory expansions, disk types, etc]

Additional context
This issue occurs for only about a second or a few seconds before going away automatically when in Apple II DeskTop and not in Disk Copy or a desk accessory.

[c0mmander8]

This issue also applies to all dialog boxes in Apple II DeskTop, in Disk Copy, in the Selector and in desk accessories.

[inexorabletash]

Yep. The clock also doesn't update in these cases.

Only the main DeskTop event loop has a counter for resetting the IIgs mode and updating the clock. Nested event loops don't do this.

[inexorabletash]

A checklist of places to tackle:

• Windowed Desk Accessories
• DeskTop dialogs
• DeskTop alerts
• Disk Copy
• Disk Copy dialogs
• Disk Copy alerts
• Selector
• Selector dialogs
• Selector alerts

Alerts are a separate code path from dialogs, they have single-line messages and no title.

[inexorabletash]

Somehow a glitch is introduced where Selector hangs if the video is reset during an alert, after the alert is dismissed. I haven't been able to determine why yet.

EDIT: This isn't new, seems to be a pre-existing issue. More specifically: if the IIgs Control Panel is entered while Selector has an alert showing, the app hangs after the dialog is dismissed.

[c0mmander8]

Did you also fix updating the clock in these cases?

[c0mmander8]

Please update "* IIgs: Mono DHR is re-enabled when returning from system control panel. (#193)" in RELEASE-NOTES.md to say
"* IIgs: Mono DHR is re-enabled when returning from system control panel. (#193, #440)" instead.