The NEdit window unnecessary grow, when a file is opened with a linenumber width that is less or equal the current gutter width, after a first resize was necessary.
CVS from 2007-01-05, and set MIN_LINE_NUM_COLS to 3 (just to force the problem with small files), with show line numbers option enabled.
open file with < 1000 lines (source/calltips.c)
=> window size doesn't changed
open file with >= 1000 lines (source/macro.c)
=> window size changed by 1, only the gutter (now 4)
open file with < 1000 lines (source/linkdate.c)
=> window size changed by 1, but the gutter is still 4 width