* Fixed an issue where users are not warned when leaving unsaved documents.
* Fixed an issue where objects are marked as changed even when they are not.
* Fixed an issue where deleted objects stayed in the local database and were not removed. (They appeared after every restart of the app in the changed objects list.)
* A problem in reverting local changes (from the local database) is solved now.
* A sorting problem when displaying multiple overlays is solved now. The map overlays will be displayed as expected.
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