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Hello,

On Debian Buster with the (last) commit 067681c6

opening a file trigger some error about Pango.Layout.set_text() arguments mismatch.

Traceback (most recent call last):
  File "/home/lkppo/devel/meld/meld/sourceview.py", line 225, in notify_overscroll
    self.props.bottom_margin = self.overscroll_num_lines * self.line_height
  File "/home/lkppo/devel/meld/meld/sourceview.py", line 219, in line_height
    layout.set_text('X')
TypeError: Pango.Layout.set_text() takes exactly 3 arguments (2 given)
Traceback (most recent call last):
  File "/home/lkppo/devel/meld/meld/sourceview.py", line 225, in notify_overscroll
    self.props.bottom_margin = self.overscroll_num_lines * self.line_height
  File "/home/lkppo/devel/meld/meld/sourceview.py", line 219, in line_height
    layout.set_text('X')
TypeError: Pango.Layout.set_text() takes exactly 3 arguments (2 given)
Traceback (most recent call last):
  File "/home/lkppo/devel/meld/meld/sourceview.py", line 225, in notify_overscroll
    self.props.bottom_margin = self.overscroll_num_lines * self.line_height
  File "/home/lkppo/devel/meld/meld/sourceview.py", line 219, in line_height
    layout.set_text('X')

I did something and get a bunch of Gtk assertions. Can't say what as I tried again and I can't trigger it.

TypeError: Pango.Layout.set_text() takes exactly 3 arguments (2 given)
2020-07-19 13:19:54,450 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:19:54,450 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:19:54,451 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:19:58,146 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:19:58,146 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:19:58,147 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:00,730 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:00,731 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:00,731 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:01,858 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:01,858 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:01,858 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:07,097 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:07,097 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:07,097 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:08,898 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:08,898 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:08,899 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:10,258 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:10,258 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:10,259 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:11,009 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:11,010 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:11,010 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:17,149 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:17,150 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:17,150 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:19,069 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:19,069 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:19,069 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:32,538 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:32,538 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:32,539 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:43,354 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:43,354 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:43,355 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:44,498 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:44,498 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:44,499 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed
2020-07-19 13:20:45,194 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:45,194 CRITICAL Gtk: real_set_mark: assertion '_gtk_text_iter_get_btree (where) == tree' failed
2020-07-19 13:20:45,195 CRITICAL Gtk: gtk_text_buffer_set_mark: assertion 'gtk_text_iter_get_buffer (iter) == buffer' failed