Double-clicking inside a text widget "leaks" to the other widgets
When you click inside a text widget like a
Gtk.Entry or a
Gtk.TextView, the double-clicking gesture is not blocked and handled only by the text widget, but also handled by the widget surrounding it.
I noticed this when I had a
Gtk.TextView inside the bottom bar of a
Adw.ToolbarView. Double-clicking in the TextView now maximizes the window, while still selecting a line in the TextView.
Gtk.SearchEntry received a fix for just this problem in the past already.