Comment 9 for bug 1267958

(In reply to b3nmore from comment #5)
> Created attachment 5103 [details]
> Should fix: line numbers are always printed
>
> Second approach was too simple and left
> gtk_source_print_compositor_set_print_line_numbers in some cases in
> undefined/wrong state. The attached patch hopefully handles this more robust.

Sorry, but the patch doesn't solve the problem here.
Also notice that the patch tries to rename the filename and has to be applied on the mousepad/mousepad folder(where the source files are), I think it should be applied on mousepad(where the configs files are).
I'll try to investigate this problem soon.