This was caused by incorrectly implemented store/restore mechanism for
`move_strips` property. The property was restored to original state
immediately after strip was added when using drag and drop. So when any
other property was modified, on redo the modal move operation would
start.
The store/restore mechanism was removed, because it is possible to only
rely on checking whether invoke function was called by drag event.
The move strips property is now hidden in redo panel, because it does
not make sense to ever change it there. This is done by setting hidden
`skip_move` property and setting `move_strips` property hidden flag.
Another slightly related bug was discovered, that move strips feature
is incompatible with replace selection feature being disabled. So the
property is not drawn when move strips feature is enabled.
Pull Request: https://projects.blender.org/blender/blender/pulls/144172
a745d6cc69