SUMMARY
If I select text in KDiff3's A/B/C panels, I cannot Ctrl+C or menu Edit->Copy until I switch to another window (or diff panel) and back.

STEPS TO REPRODUCE
1. Launch KDiff3 comparing two or three files.
2. Select text in the panels.
3. Try to copy text.

OBSERVED RESULT
You cannot copy (or cut) text until switching to another window and back (eg. minimizing and unminimizing KDiff3, alt-tab and back, or clicking another window and back). And once you do this, if you unselect text, the Copy menu item is mistakenly enabled until you switch windows and back.

If you click another diff panel and back, this also reloads the "can copy" status (and clears the selection in any diff panel you click).

If you *right-click* another diff panel and back, this properly reloads the "can copy" status to "is text selected in the current panel".

If you click another diff panel's *filename*, it sets the "can copy" status to true, but copying does nothing.

EXPECTED RESULT
The Copy and Cut actions reload their activation status whenever the (existence of a) selection in the current panel changes.

I'm not sure whether copying a selection should always look in the current panel, but I think that was the design intent.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.14.14-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 5600X 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce GT 730/PCIe/SSE2

ADDITIONAL INFORMATION