Add some missing shortcuts to the shortcuts dialog

- Unselect all text
- Move viewport up within the file
- Move viewport down within the file
- Move viewport to end of file
- Move viewport to beginning of file
- Move to matching bracket
1 job for master in 6 minutes and 33 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #274561
flatpak

00:06:33