Add missing "const" qualifier to CanCut and CanCopy so that they override the virtual functions in wxTextCtrl.
This required a little rework to a helper function IsTextSelected() to make it const, as well. This fixes two -Woverloaded-virtual warnings in gcc.
Authored by: david_costanzo 2026-05-30
Parent: [r6242]
Child: [r6244]
