It just happened to me, on Linux Ubuntu.
First, Sublimetext updates automatically, without asking me the confirmation.
Seconds, I lost the whole session, included unsaved tabs and saved tabs.
The feature to save the unsaved tabs in the session is an extremely useful feature for me!
If ST4 has no that intention, it should be set as parameter in the setting file, set by default to ‘true’ as it was in ST3.
Last, it’s obvious that ALL data that the program does not automatically save on closing without prompt the user is a data loss, (= a bug), without any doubt.
So, now, there is a way to get back the unsaved tab’s contents?
Thanks