GitLab

 * xterm.h: Declare x_x_to_emacs_modifiers.

 * gtkutil.c (xg_tool_bar_button_cb): New function.
 (xg_tool_bar_callback): Call x_x_to_emacs_modifiers to
 store modifiers in event.
 (update_frame_tool_bar): Connect button-release-event to
 xg_tool_bar_button_cb.