[dolphin] [Bug 445006] New: Drag&drop in Dolphin is rendered in low resolution

[Jin Liu]

https://bugs.kde.org/show_bug.cgi?id=445006

            Bug ID: 445006
           Summary: Drag&drop in Dolphin is rendered in low resolution
           Product: dolphin
           Version: 21.08.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: view-engine: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: ad.liu.jin at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 143229
  --> https://bugs.kde.org/attachment.cgi?id=143229&action=edit
Drag&drop, dolphin, single file

SUMMARY
When dragging a single file in Dolphin (details mode), both the icon and text
seems rendered in low resolution, with jagged edges. (attachment1)
When dragging multiple files, the icons look better, but still not as smooth as
the original. (attachment2)
Icons and compact mode is better, but still not perfect. (attachment3). 

Dragging in other apps, e.g. VSCode, looks ok. (attachment4)

Tested in X11 and Wayland. Same problem.

I'm using 250% zoom. Maybe this has something to do with it? (the text looks
quite like rendered in low resolution and upscaled 250%).

(As a sidenote, as you can see in attachment3, the "desktop" icon has a
grey-out effect when selected, only in icons mode. Other two modes, or other
desktop icons, don't have this effect. Not sure if this is intended or not.) 

STEPS TO REPRODUCE
1. Open Dolphin.
2. Switch to details mode.
3. Drag a single file.

OBSERVED RESULT
Icon and text has jagged edge.

EXPECTED RESULT
Icon and text is as smooth as the drag source.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 21.08.3
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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