Ctrl+Click clears the selection instead of unselecting a single clip
Steps to reproduce:
- Create a new project
- Import a video file,
- Add two clips to the timeline,
- Select both using ctrl-click
- Ctrl-click one of them, notice both are deselected when only the clicked clip should have been.
A unittest should be added. The toggle_clip_selection which simulates the Ctrl+click on a clip should allow writing a test easily.