[dolphin] [Bug 503372] New: Automatically-sized Size column is too narrow when re-visiting a directory

[Jin Liu]

https://bugs.kde.org/show_bug.cgi?id=503372

            Bug ID: 503372
           Summary: Automatically-sized Size column is too narrow when
                    re-visiting a directory
    Classification: Applications
           Product: dolphin
           Version: git-master
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: view-engine: details mode
          Assignee: dolphin-bugs-null at kde.org
          Reporter: ad.liu.jin at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
With Automatical Column Size on, the Size column would be correctly sized when
you first-time visit a directory which has a sub-directory of more than 1000
items. But when you navigate away then go back to that directory, the Size
column would be too narrow.

Debugging shows that when a directory is cached, the data
`KItemListView::preferredColumnWidths` receives are all "0 items" for
sub-directories.

STEPS TO REPRODUCE
1. `cd` to some directory where a sub-directory has more than 1000 items.
2. `dolphin .`
3. The Size column is wide enough to show "1000 items".
4. Navigate to home.
5. Press Back.

OBSERVED RESULT
The Size column is too narrow to show "1000 items".

EXPECTED RESULT
The Size column has the same width as in step 3.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.3.80
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5600H with Radeon Graphics
Memory: 16 GiB of RAM (15.0 GiB usable)
Graphics Processor: AMD Radeon Graphics

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