I found a bug. Try this to reproduce:
1. Make a new note.
2. Add a few lines of text.
3. Make one of those newfangled ordered lists. Make two items, a 1 and a 2.
4. Make a third item, but hit enter again to delete the number 3 and
go to the next blank line.
5. Press Ctrl+Backspace twice. The main Zim window should crash.
Here's the error I see when running with -D:
Invalid text buffer iterator: either the iterator is uninitialized, or
the characters/pixbufs/widgets in the buffer have been modified since
the iterator was created.
You must use marks, character numbers, or line numbers to preserve a
position across buffer modifications.
You can apply tags and insert marks without invalidating your iterators,
but any mutation that affects 'indexable' buffer contents (contents
that can be referred to by character offset)
will invalidate all outstanding iterators
_gtk_text_buffer_get_line_log_attrs: assertion `GTK_IS_TEXT_BUFFER
DEBUG: Child exited 24304 (u'zim.gui.GtkInterface',
DEBUG: No such signal: notebook-list-changed
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