Fix visibility of commit on save/discard popup when saving

When after a change in the GWT UI, the save/discard popup is used to "save", there is sve feedback message as if it went ok, but the git history does not record any change.

Reproduced on my sandbox, giving steps to reproduce (my sandbox is using the "intermediate" commit mode if that matters):

• go to an existing schema definition
• add a field
• do not save
• navigate to another feature (another schema for instance)
• the save/discard popup is presented because changes were detected: chose to save
• "Changes saved." feedback message appears
• go to the "branch management" section to see the changes committed --> they re not visible

Note a full refresh of the project shows the content has been saved and committed still --> this seems to be a missing refresh of the screen showing commits