Hi, this is my first bug report. Thank you for making krita an excellent software :)

SUMMARY
In the latest nightly appimage, krita 5.3.0 3f968be4ab, adding a new layer via a shortcut that contains "Shift" (ex. adding a new vector layer with the default shortcut "Shift+Insert") leaves the old layer selected. Both the old and the newly created layer are selected.

I also have a custom shortcut "Shift+Up" for adding a paint layer, and the same thing happens too.

This is bothersome because subsequent actions (ex. group layers, move layers up/down, toggle alpha lock) apply to both selected layers, and requires systematically deselecting the old layer in order to exclude it from the action.

Executing the equivalent action via the menu (Layer > New > Add vector layer) or using the "+" button in the layer docker does not produce the bug.

STEPS TO REPRODUCE
1. Open a krita document with one layer
2. Select the layer in the layer docker
3. Add a new vector layer with the shortcut "Shift+Insert"

OBSERVED RESULT
Both the old and new layer are selected.

EXPECTED RESULT
Only the new layer is selected.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
I tried to reproduce in a few nightly appimages I had laying around :
- 2b41674864 (2025-12-17) : no bug
- f15d826435 (2025-12-20) : no bug
- 74b40eb94f (2025-12-23) : no bug
- ff1d70541d (2025-12-29) : bugged

I'm fairly sure it's caused by the following commit from December 25. A few days ago, I reverted it locally and no longer had the problem, although it's harder to revert today because there are some git conflicts :
- https://invent.kde.org/graphics/krita/-/commit/d3eaaf15976380a5df6370dfa9ccd7f5b281f34f