Replace gtk3 deprecated APIs that have simple replacements. #19435
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set_double_buffered (deprecated since gtk3.14) is unnecessary, gtk
(even gtk2) defaults to being double-buffered (this line of code comes
from the old gtk2 backend which used to disable double buffering).
https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-set-double-buffered
gtk_window_get_pointer is deprecated since gtk3.0.
https://developer.gnome.org/gdk3/stable/gdk3-Windows.html#gdk-window-get-pointer
get_window_size_request is deprecated since gtk3.0. Also inline
add_widget, which is used exactly once.
https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-size-request
PR Summary
PR Checklist
pytest
passes).flake8
on changed files to check).flake8-docstrings
and runflake8 --docstring-convention=all
).doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).