SUMMARY
In recent krita(4.2.6) on linux it's impossible to move a selection(not the contents of a selection but the selection itself) by outline selection tool. Every other selection(to be more precise the selection tool that is selected) works as intended i.e. if there are a composite selection made with different selection tools like box, outline and circle and the selected selection tool is NOT the outline selection tool the resulted selection can be moved.


STEPS TO REPRODUCE
1. Create a new file.
2. Select the outline selection tool and make a selection with it.
3. Try to move the selection by dragging it by it's border.


OBSERVED RESULT
The actual result being the tool starting to make a new selection.


EXPECTED RESULT
It is expected that it would drag the selection.


As I was saying above a selection made with a outline selection tool CAN be moved but for dragging it a user should switch to any other selection tool(box, circle or polygonal) then dragging the selection by it's border works as intended. I've make a few tests with krita versions I have on disk and the results are:

4.1.7: the feature not presented
4.2.2: everything(every selection tool available) works as intended
4.2.3: Moving box/circle/polygonal works, outline selection gives no "move" cursor when hovering on a selection border so no moving available for it.
4.2.5: same as 4.2.3

I'm using ubuntu 18.04 with nvidia drivers 430.40