The history buffer was defaulting to a normal GtkTextTagTable which was breaking stuff. This wasn't noticed before as a TalkatuTagTable is usually set up via glade.
/*
* talkatu
* Copyright (C) 2017-2019 Gary Kramlich <grim@reaperworld.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include<gtk/gtk.h>
#include"talkatu/talkatuactiongroup.h"
#include"talkatu/talkatuwholebuffer.h"
/**
* SECTION:talkatuwholebuffer
* @Title: Whole Buffer
* @Short_description: A whole format text buffer
*
* TalkatuWholeBuffer is a #GtkTextBuffer who's formatting applied to the
* entire buffer and not on a character by character basis.
*/
/**
* TALKATU_TYPE_WHOLE_BUFFER:
*
* The standard _get_type macro for #TalkatuWholeBuffer.
*/
/**
* TalkatuWholeBuffer:
*
* A #TalkatuBuffer subclass that applies formatting to the entire buffer
* rather that allowing rich formatting at character resolution.