text-input: Clear out context->input pointer

If we destroy the text_input (e.g. due to surface deactivation) whilst
the IM manager (the client holding the input_method_context resource,
usually weston-keyboard) sends an event, we can hit a segfault in
text-backend. This is because we free the text_input structure, but
don't actually clear the context->input structure even when we send the
deactivate event.

This is clearly intended to be catered for, since context->input is
always checked for NULL before we relay any events.

This is enough to fix one cause of text-test failing, but it's
ultimately error-prone until we have a no-op test-shell; there is still
a race where weston-desktop-shell can launch weston-keyboard before
text-test manages to bind zwp_text_input_manager.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Maniphest Tasks: https://phabricator.freedesktop.org/T7615
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

compositor/text-backend.c

@@ -132,6 +132,7 @@ deactivate_input_method(struct input_method *input_method)
 		zwp_input_method_v1_send_deactivate(
 			input_method->input_method_binding,
 			input_method->context->resource);
+		input_method->context->input = NULL;
 	}
 
 	wl_list_remove(&input_method->link);