sourceview: Add missing keybinding for selection.join and .sort
Presumed to be lost in the port to GTK 4 / GtkSourceView 5, as these actions used to be signals and the keybindings were set in the CSS theme.
Fixes #2145 (closed)
Presumed to be lost in the port to GTK 4 / GtkSourceView 5, as these actions used to be signals and the keybindings were set in the CSS theme.
Fixes #2145 (closed)