(mac_display_info_for_display): Remove function.
(mac_flush_display_optional) [USE_CG_DRAWING]: New function. (x_redisplay_interface) [USE_CG_DRAWING]: Set it as handler for flush_display_optional. [USE_TOOLKIT_SCROLL_BARS] (x_scroll_bar_handle_press): New argument MOUSE_POS. All uses changed. Set bar->dragging to negative integer if scroll bar handle is pressed. [USE_TOOLKIT_SCROLL_BARS] (x_scroll_bar_handle_release): Negative bar->dragging means scroll bar handle is not dragged. [USE_TOOLKIT_SCROLL_BARS] (x_scroll_bar_handle_drag): Get initial offset of scroll bar handle from negative bar->dragging. (XTread_socket) [USE_TOOLKIT_SCROLL_BARS]: Modifiers for scroll bar click is compared against mapped one. Set down/up_modifier for scroll bar click event with control key.
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