Minimise does not work after application has exited

[TheGuardianWolf]

There seems to be a bug where clicking the thunderbird icon in the task bar does not do anything once it is maximised.

To reproduce:

1. Open ThunderbirdTray
2. Hide Thunderbird via minimise
3. Exit ThunderbirdTray
4. Restore by clicking the Thunderbird icon in task bar
5. Click the icon in task bar again, it should minimise but it does not

If Thunderbird's "restore" button is clicked before clicking on the taskbar icon though, this issue is less severe, certain mouseclicks will trigger this issue but spam clicking works.

[TheGuardianWolf]

The answer by craisin here has more hints about what is going on and a workaround

https://superuser.com/questions/1112744/window-in-focus-doesnt-minimize-when-i-click-on-its-icon-in-the-taskbar-window

It does seem like an explorer bug rather than some issue with my particular application, although my use case is triggering it.

[TheGuardianWolf]

An additional answer has explained more:

https://stackoverflow.com/questions/25807661/c-restoring-a-window-using-showwindow-disables-its-minimize-capability

To fix this issue, instead of showing Thunderbird in minimised mode if the application is hidden when exited, I am showing it in normal mode. There does not seem to be a real fix to this aside from developing a companion addon for Thunderbird, something I wished to avoid.

See aeedc75

[TheGuardianWolf]

No further ideas, closing for now