https://bugs.kde.org/show_bug.cgi?id=510344

            Bug ID: 510344
           Summary: Panel Hide/Show Animation briefly extends the panel
                    under fit-content setting
    Classification: Plasma
           Product: plasmashell
      Version First 6.4.5
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Panel
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: 1.0

Created attachment 185576
  --> https://bugs.kde.org/attachment.cgi?id=185576&action=edit
Video Showcase of the Reported Bug

SUMMARY
Sometimes, when an auto-hide, centered, fit-content panel is shown (via e.g.
meta key or cursor at the edge of the screen), a small blank area is added on
the right side of the panel for a second, before the panel returns to normal
width.

STEPS TO REPRODUCE
1. Set default setting panel to auto-hide
2. Set panel to fit-content
3. Leave the panel hidden for awhile (several minutes)
4. Open the panel (edge or meta key)

OBSERVED RESULT
For a brief second during the animation, the panel gets wider, due to a blank
area added to the right end of the fit-content panel. And then immediately
shrinks back. It is particularly noticeable when the panel is centered, since
in this case everything moves for a second.

EXPECTED RESULT
The panel slides up without any horizontal movements.

SOFTWARE/OS VERSIONS
Linux: 6.16.10-arch1-1 (64 bit)
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Graphics Platform: Wayland

ADDITIONAL INFORMATION
Since system clock widget is by default on the right edge of panel, I have
tried moving it away. With system tray on the right edge, the same problem
occurs. Whether or not the panel floats does not seem to play a role either.
This problem does not occur every time the panel opens. It seems to only happen
once the panel is left idle for awhile.

A screencast video is attached to show the problem.

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