The second issue can be reproduced this way:
Set your maximum editor to 1.
Verify that this worked by opening one file and opening another second file.
The first file is closed and only the second file is open. Good.
Now modify the second file (e.g. just remove the Enter at the end).
Notice that this worked by inspecting the tab with the filename. It should contain an asterix (*).
Now open the first file or a third new file.
Notice that now both files are open. The second file and the first resp. the third file. This disrespects the number of maximum editors.
