Status: Fixed for next update.
As we just had some great improvements of the editor, I can continue with some less important suggestions: ;)
Currently whenever you change the size of the level, the screen jumps to position (0, 0). It would be much more natural to keep the current screen position, respectively use the best approximation thereof if the current position would show something no longer in the level.
Reclassified this as a bug, since that's probably more accurate. Anyway, while I've noticed this, it never bothered me enough that I remembered about it when working on the editor. Now that I know it actually is bothering someone - and have a topic here to remind me - it'll probably be fixed next time I'm working on the editor.
Fixed for next update. :)