Fix wrong progress when loading session.
The code was trying to show one tick for each editor that is opened, but editors are actually only opened for a file, if it is visible in a view. So editorOpened is only sent for one editor per open split. The new code just shows one tick for restoring editors, to keep things simple. Change-Id: I6a24061858f532c3ccfded9677b8928ae62a1448 Reviewed-by: Daniel Teske <firstname.lastname@example.org>