[kde] [Bug 473346] New: Sub-menus overlap menus when window is not maximized

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https://bugs.kde.org/show_bug.cgi?id=473346

            Bug ID: 473346
           Summary: Sub-menus overlap menus when window is not maximized
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: guimarcalsilva at gmail.com
  Target Milestone: ---

SUMMARY
Some windows like Dolphin or Gwenview have hamburger menus on the right side of
the window. When the window is maximized, sub-menus appear on the left side of
the menus as expected (because there's no space on the right), however, if the
same window is unmaximized and close to the right edge of the display, the
sub-menus appear on top of the menu, obstructing the buttons below.

While I'm using hamburger menus as an example, this is NOT specific to
hamburger menus, but it's harder to notice because menus in a toolbar usually
aren't close to the edge of the screen. The following video illustrates the
issue:
https://www.youtube.com/watch?v=cHaSOQs_Cik

STEPS TO REPRODUCE
1. Open Gwenview (with a hamburger menu to make it easier to reproduce)
2. Maximize, open the hamburger menu, and then hover over an item that opens a
sub-menu. Notice how it opens to the left.
3. Now unmaximize, move the window to the right edge of the screen, and do the
same.

OBSERVED RESULT
The submenu appears on top of the menu, obstructing the items below

EXPECTED RESULT
When there's space to the left and not on the right of the menu, open submenus
on the left side instead of putting them on top of the menu, just the way it
happens for maximized windows.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.108.0
Qt Version: 5.15.10
Kernel Version: 6.2.0-26-generic (64-bit)
Graphics Platform: Wayland
Processors: 6 × Intel® Core™ i5-9400F CPU @ 2.90GHz
Memory: 15,4 GiB of RAM
Graphics Processor: AMD Radeon RX 570 Series

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