[kmail2] [Bug 481135] New: Closing KMail window with system tray icon enabled doesn't always close the window

[Stefano Crocco]

https://bugs.kde.org/show_bug.cgi?id=481135

            Bug ID: 481135
           Summary: Closing KMail window with system tray icon enabled
                    doesn't always close the window
    Classification: Applications
           Product: kmail2
           Version: 5.240.95
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: stefano.crocco at alice.it
  Target Milestone: ---

SUMMARY
In KF5, when the system tray icon is enabled in KMail, closing the window with
Alt+F4 or with the X button on the title bar used to close the window, leaving
only the system tray icon. However, with KF6 version of KMail, this only
happens a few times (often only once) after the application has been launched.
After that, closing the window minimizes it instead, leaving it on the task
bar. When this starts to happen, there's no way to restore the correct
behaviour except quitting KMail altogether (using the File/Quit menu entry).
This doesn't seem to happen if closing the window by clicking on the KMail icon
in the system tray.

When the behaviour described above starts happening, clicking on the KMail icon
in the system tray shows the window again, but it forget its maximized state.
This doesn't happen when restoring it by clicking on the corresponding entry in
the task.

STEPS TO REPRODUCE
1. Launch KMail and ensure that the "enable system tray icon" option is checked
2. Close the KMail window using the X button on the title bar or the Alt+F4
shortcut. It may be necessary to display the window and repeat this a couple of
times to trigger the bug

OBSERVED RESULT
KMail window is minimized and still visible in the task bar. When clicking on
the system tray icon to show it again, the window is not maximized, even if it
was maximized when I closed it

EXPECTED RESULT
KMail window gets closed and it disappear from the task bar. When clicking on
its system tray icon, KMail window is restored keeping the previous maximized
state.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Gentoo Linux 
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION
Gentoo doesn't provide official packages for the KF6 version of KDE Gear, so I
installed them using the Gentoo KDE overlay

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