Update, sometimes Geany crashes when typing in a rectangular selection passes the line breaking position (and breaking is on of course).
Some of the [backtrace](https://gist.github.com/elextr/23ddd07162e19df53682a88c6dcee670) . Its clearly in a loop and I got bored typing return.
It doesn't crash every time, other times it behaves as described in the OP.
``` 09:37:23: Geany INFO : Using alternate configuration directory 09:37:23: Geany INFO : Geany 1.35 (git >= 4452b36), en_AU.UTF-8 09:37:23: Geany INFO : GTK 3.18.9, GLib 2.48.2 ``` Empty config that doesn't exist so no plugins and default settings except `Document->Line breaking` of course.
Looks like it loops through `editor.c:check_line_breaking()` inserting a newline causing a changed notification from Scintilla causing a call to `check_line_breaking()` etc. But I can't see why it only crashes sometimes @b4n?