I have a one line of text which is 25,000 characters long (its a compile command - yes very inefficient I know, I didn't design it). The trouble comes in when searching for words - notepad++ can't show the exact word. Also when selecting everything, the selection highlight becomes corrupted, although everything appears to actually be selected. Taking word wrap off makes the line disappear completely.
Also in regex, support for ? and | would be great.
Keep up the good work.
I had a similar (or the same) problem.