Steps

1. open main window
2. search a word, that is included just in a few notes
3. open one of these notes
4. ESC close the search field
5. return to the main window
--> the search field is not present
--> however only positive results are shown
==> it looks like many notes disappeared


6. toggle the search button
--> empty search field appears
--> all notes reappeared


I don't know what should be shown at step 5)
- the positive notes, but then the search field should be there
- or all the notes