Bug 426196

Dolphin can incorrectly move files/folders while holding down the Control key

STEPS TO REPRODUCE
1. mkdir -p ~/test/test2
2. touch ~/test/test2/file.txt
3. Open ~/test/test2/ in Dolphin
4. Open ~/test/ in a new Dolphin window (using another window is important; the issue seems to not occur if using tabs within the same Dolphin window)
5. WITHOUT holding down the Control key and WITHOUT releasing the left mouse button, drag ~/test/test2/file.txt to ~/test
6. After the mouse is finished moving, hold down the Control key WITHOUT moving the mouse any further, and then release the left mouse button

OBSERVED RESULT
After releasing the left mouse button, file.txt is moved from ~/test/test2 into ~/test rather than being copied.

EXPECTED RESULT
After releasing the left mouse button, file.txt should be copied from ~/test/test2 into ~/test.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon Unstable Edition
KDE Plasma Version: 5.19.80
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION
I noticed that if I use a single Dolphin window (with ~/test/test2 and ~/test as separate tabs) to perform the file copy operation, the issue seems to not occur.

Issue does not occur when running Kubuntu 20.04.1 LTS from a live image. (Dolphin version 19.12.3)
Issue occurs when running neon-user-20200827-0945.iso from a live image. (Dolphin version 20.08.0)
Issue occurs when running neon-testing-20200901-1829.iso from a live image. (Dolphin version 20.08.0)
Issue occurs when running neon-unstable-20200830-0330.iso from a live image. (Dolphin version 20.11.70)
Issue still occurs after installing KDE neon Unstable Edition and updating all packages. (Dolphin version 20.11.70)

The system I first encountered this issue on is running Manjaro, but this does not seem to be a Manjaro-specific issue.