GtkText was handling this just on grab_focus, which is
not the only way anymore that focus can reach it. Instead,
shift this to focus-in, and add a property that can be
used to override the select-on-focus setting. Remove
the gtk_text_grab_focus_without_selecting(), but keep
the GtkEntry variant of the function, reimplemented
to use the properties. GtkSearchEntry sets the select-on-focus
property of its text to FALSE, to match expectations.
530e3ff9c7
