Bug 478506

SUMMARY

When starting a drag&drop action in the file panel the detection of "start dragging" fails and selects wrong item.

The wrong item is visibly marked but usually not used as item-to-be-dragged then. 
So it seems like an optical issue only. But it isn't only that! 

If Krusader is configured to use e.g. TotalCommander selection mode, the above mentioned item gets dragged and not the chosen one! I tracked it down to the "Left mouse button selects" option. If that one is unchecked that bug has those real consequences.

To make it really obscure it only happens in the first place if the dragging-action is started in a special way, see below.

(Sorry for that many words, it's hard to describe, especially if one isn't a native speaker...)


STEPS TO REPRODUCE
1. Open Krusader with default settings
2. Navigate to a folder with some files *and* directories
3. Select a file by clicking on it
4. Start dragging the file with the mouse by carefully clicking on the upper half of its name/line/entry and then move the mouse exactly upwards leaving the bounds of the current file entry.
5. A/the dotted frame jumps to the entry just above the current one.
6. continue the dragging to any folder and drop the file
7. the correct file has been dragged, the wrong dotted line was only an optical issue

8. Deactivate the configuration "Panel - Selection mode - Left mouse button selects"
9. Restart Krusader
10. Repeat the above dragging
11. The wrong (upper) file gets dragged, not the initial and expected one.

That might lead at least to user's irritation but also to missing files/folders if not observed at that exact moment!

The same faulty dragging-start-detection can be seen if the drag starts in the lower part of the file name/line and the mouse gets moved downwards.

Those two mouse movements need to be almost perpendicular, that means up and down but not diagonally or such.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 39 / Tuxedo OS (Ubuntu)
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.111.0 / 5.112.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
The described behaviour also happens on those two tested systems when running i3wm instead of KDE Plasma.