Provide a more relevant message for Add actions
Avoid null pointer exception when no commit is selected
Provide a maximum value for the X axis for the graph views to avoid loooooooong delays (to dispay deceleration tables to maxint)
Deactivate synchronization during long operations to speed them up (since they are modal, during long operations one cannot browse the model)
Allow to stop updating Blame data
Set test execution as LongOperation (and as such, do not perform synchronization during such operations (see 41fa1dee6ff943c76be74fb5ed3ee926526df19b))