[dolphin] [Bug 507844] Image on the preview panel increases brightness instead of switching to the next one when switching files

[Pan Zhang]

https://bugs.kde.org/show_bug.cgi?id=507844

Pan Zhang <zhangpan at kylinos.cn> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
      Latest Commit|                            |https://invent.kde.org/syst
                   |                            |em/dolphin/-/commit/96019a8
                   |                            |592788932443fe0d0efc8ea44af
                   |                            |2cf948
             Status|ASSIGNED                    |RESOLVED

--- Comment #3 from Pan Zhang <zhangpan at kylinos.cn> ---
Git commit 96019a8592788932443fe0d0efc8ea44af2cf948 by Pan Zhang.
Committed on 28/09/2025 at 04:12.
Pushed by meven into branch 'master'.

informationpanelcontent: prevent repeated disabled effect on previews

When switching files quickly in the Information Panel, the preview pixmap could
appear progressively brighter/whiter. This happened because
markOutdatedPreview() was applying KIconEffect::toDisabled() multiple times on
the same pixmap while a preview job was still pending.
This patch fixes the issue by:
- Tracking the URL that was last disabled, and only applying the disabled
effect once per URL.
- Clearing the disabled state whenever a new preview job starts or when a new
pixmap is shown.

With this change, the "disabled preview" effect is preserved (still useful for
slow HDD or network filesystems), but the progressive white-out artifact no
longer occurs when navigating rapidly.

M  +14   -2    src/panels/information/informationpanelcontent.cpp
M  +1    -0    src/panels/information/informationpanelcontent.h

https://invent.kde.org/system/dolphin/-/commit/96019a8592788932443fe0d0efc8ea44af2cf948

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