[dolphin] [Bug 498284] New: In Dolphin, F12 can cause glitches when the number of lines of file changes

[Dilam]

https://bugs.kde.org/show_bug.cgi?id=498284

            Bug ID: 498284
           Summary: In Dolphin, F12 can cause glitches when the number of
                    lines of file changes
    Classification: Applications
           Product: dolphin
           Version: 24.12.0
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: view-engine: icons mode
          Assignee: dolphin-bugs-null at kde.org
          Reporter: dimitri-r at gmx.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 177127
  --> https://bugs.kde.org/attachment.cgi?id=177127&action=edit
Video of glitch with F12 and conditions of bug

SUMMARY
When pressing F12 in Dolphin (which changes the thumbnail) can cause glitches
in case where the number of lines of a file name is increasing as the file is
showing smaller. The glitch appears where the name was when it was changing. It
left a part of it behind.
It only happen with files that have a name close to getting a new line.
Having a second line of files or no zooming-out animation remove the glitch.
The glitch is sometime only visible with files selected.
The bug does not appear for all level of zoom, only for some of them like
96pixels.


STEPS TO REPRODUCE
1. Have a folder is only one line of files, a zoom level of 96pixels, and files
with name close to getting a new line, like the name "F12 glitches when more
lines appear.txt".
2. Selecting files (to increase the visibility of the glitch)
3. Pressing F12
4. If the name(s) has a number of lines that increased and if the zooming
animation has played (not skipped to the new size), see if something was left
under files.

OBSERVED RESULT
There are glitches under those very specific conditions.

EXPECTED RESULT
No glitches should appear.

SOFTWARE/OS VERSIONS
Dolphin: 24.12.0
Operating System: KDE neon 6.2
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1
Kernel Version: 6.8.0-51-generic (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
This bug remembers me a lot the bug 432530 where some file's name have a line
that shouldn't exist and create glitches. Those bugs have a similar cause (but
different) and the glitch then behave the same way (like disappearing if the
mouse enter or exist the folder view).

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