Merge branch 'gesture-click' into 'master'

Rename GtkGestureMultiPress to GtkGestureClick

See merge request GNOME/gtk!878

diff --cc demos/gtk-demo/changedisplay.c
Simple merge

diff --cc docs/reference/gtk/gtk4-sections.txt
Simple merge

diff --cc docs/reference/gtk/migrating-3to4.xml
Simple merge

diff --cc gtk/gtkwindow.c
Simple merge

diff --cc tests/testgtk.c
Simple merge