To be able to customize the double-click and triple-click behaviors, to provide custom selection boundaries.
https://bugzilla.gnome.org/show_bug.cgi?id=111503
020258f textview: add extend-selection signal
docs/reference/gtk/gtk3-sections.txt | 1 +
gtk/gtktextview.c | 135 +++++++++++++++++++++++++++-------
gtk/gtktextview.h | 24 +++++-
3 files changed, 134 insertions(+), 26 deletions(-)
Upstream: git.gnome.org