Visualize local branch heads in commits panel

We want to mark all local branch heads with a "*" in the local commits panel, to
make it easier to see how branches are stacked onto each other. In order to not
confuse users with "*" markers that they don't understand, do this only for the
case where users actually use stacked branches; those users are likely not going
to be confused by the display. This means we want to filter out a few branch
heads that shouldn't get the marker: the current branch, any main branch, and
any old branch that has been merged to master already.

pkg/gui/controllers/helpers/refresh_helper.go

@@ -439,6 +439,12 @@ func (self *RefreshHelper) refreshBranches() {
 		self.c.Log.Error(err)
 	}
 
+	// Need to re-render the commits view because the visualization of local
+	// branch heads might have changed
+	if err := self.c.Contexts().LocalCommits.HandleRender(); err != nil {
+		self.c.Log.Error(err)
+	}
+
 	self.refreshStatus()
 }