Created attachment 240806 [details]
Demonstrates the described bug

If a buffer has more than one view associated with it (which I thought was supported; it used to work correctly) and one of the views is destroyed, editing the buffer causes messages about critical errors on the console, as shown below. The buffer is keeping references to the destroyed view widget?

The attachment demonstrates the problem. Run it with a text file as argument; click the "New window" button to open a second window; try to edit the buffer in the remaining window.

The equivalent code using GtkTextViews and a GtkTextBuffer does not suffer from this bug.

The exact version is 3.4.2-1 from Debian unstable.


/usr/lib/python3/dist-packages/gi/types.py:43: Warning: invalid unclassed pointer in cast to `GtkSourceGutterRenderer'
  return info.invoke(*args, **kwargs)

(gtksv.py:17568): GtkSourceView-CRITICAL **: gtk_source_gutter_renderer_get_view: assertion `GTK_SOURCE_IS_GUTTER_RENDERER (renderer)' failed

(gtksv.py:17568): Gtk-CRITICAL **: gtk_text_view_get_buffer: assertion `GTK_IS_TEXT_VIEW (text_view)' failed

(gtksv.py:17568): Gtk-CRITICAL **: gtk_text_buffer_get_line_count: assertion `GTK_IS_TEXT_BUFFER (buffer)' failed

(gtksv.py:17568): GtkSourceView-CRITICAL **: gtk_source_gutter_renderer_get_view: assertion `GTK_SOURCE_IS_GUTTER_RENDERER (renderer)' failed

(gtksv.py:17568): Gtk-CRITICAL **: gtk_text_view_get_buffer: assertion `GTK_IS_TEXT_VIEW (text_view)' failed

(gtksv.py:17568): Gtk-CRITICAL **: gtk_text_buffer_get_line_count: assertion `GTK_IS_TEXT_BUFFER (buffer)' failed