Ctrl+O was assigned as a shortcut in two places:
1. To the "File->Open File(s)" menu item, which is visible when only the local file
provider is enabled (i.e. the DF file provider is disabled)
2. To the "File->Open File(s)->From Disk" menu item, which is visible when there are
more than one file providers enabled.
This was creating an ambiguous shortcut, thus never opening the local file dialog.
This is now fixed by disabling the shortcuts when the respective items are not visible.
CURA-7868