Bug 431371

SUMMARY
Several times, when trying to copy a folder from one location to other location where a previous version of the folder (in this case it containning a git repo, for instance) already exists, Dolphin crashes once the user tries to select the option "Aplly for all" in the Copy/Overwrite/Omit menu that is launched in this cases.

STEPS TO REPRODUCE
1. Have a folder (Test1) with some files
2. Copy this folder to other location
3. Make some changes in the files inside Test1
4. Try to copy again the folder Test1 to the location where previously was copied
5. When the Overwrite/Omit menu appears, try to check "Apply for all" options to avoid being asked for overwrite/omit when every file is copied

OBSERVED RESULT
Dolphin crashed when try to activate this option, closing the program and cancelling the copy operation (which never starts).
This is issue is pretty similar to an very old one described in here: https://bugs.kde.org/show_bug.cgi?id=244800

EXPECTED RESULT
Dolphin should be able to copy the folder and overwrite/omit the files accordingly to the user selected option without any issues (like in previous versions). 

Operating System: KDE neon 5.20
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-58-generic
OS Type: 64-bit
Processors: 4 × AMD A6-5200 APU with Radeon™ HD Graphics
Memory: 3.3 GiB of RAM
Graphics Processor: AMD KABINI

ADDITIONAL INFORMATION
I really think this is a regression introduced at some point in the latest releases I have applied cause am using this Neon distro since 5.19 version and also use Kubuntu 18.04.5 and it never happened to me. However, since the last time I upgraded, which I don't do often cause I removed Discover and related software, am experiencing this issue. I have noted also that this is more likely to happen when the folder involved in the manual copy/paste operation is a folder containing a git repo.