Created attachment 9853 mousepad-view.c: Changed GtkTextView wrap mode to GTK_WRAP_WORD_CHAR This is caused by a change in GtkTextView itself and it affects both GTK2 and GTK3. GTK_WRAP_WORD won't wrap long words any more, only GTK_WRAP_WORD_CHAR will. Mousepad has been affected for years. Debian 8.0 with GTK+ version 2.24.25-3 is the last properly working one. If you keep your notes in mousepad and there is e.g. a long URL, it will not be wrapped any more and the horizontal scroll area will be extended that makes the whole application really inconvenient to use. I've created a patch that changes this unwanted behavior back to the original. Please consider merging it to master.
Thanks for the patch. This report is a duplicate of bug 15372 though.
Please add your comment and patch to the linked report. *** This bug has been marked as a duplicate of bug 15372 ***