Drag and drop in Carbon Emacs

[YAMAMOTO Mitsuharu]

The attached patch is for the issue that Carbon Emacs crashes when
some items are drag and dropped into a file open dialog.
Unfortunately, the control it provides is still not as fine as the X11
version; it's much like the W32 version.

                                     YAMAMOTO Mitsuharu
                                address@hidden

2004-12-29  YAMAMOTO Mitsuharu  <address@hidden>

        * term/mac-win.el: Require x-dnd.
        (mac-drag-n-drop): Sync with W32 version.  Use x-dnd.el functions.
        
        
        * macfns.c (install_window_handler): Modify extern to return OSErr
        value.
        (mac_window): Handle return value of install_window_handler.

        * macterm.c (reflect_byte): Remove function.
        (mac_create_bitmap_from_bitmap_data): Don't call it.  Lookup table
        instead.
        (mac_do_font_lists): Simplify calculation of the longest
        nonspecial string.
        [TARGET_API_MAC_CARBON] (init_mac_drag_n_drop): Remove function
        and declaration.
        (mac_initialize) [TARGET_API_MAC_CARBON]: Don't call it.
        [TARGET_API_MAC_CARBON] (mac_do_track_drag): New function and
        declaration.
        (install_window_handler): Return OSErr value.
        (install_window_handler) [TARGET_API_MAC_CARBON]: Register
        handlers for tracking/receiving drag-and-drop items.
        (do_ae_open_documents): Generate unibyte strings for filenames.
        [TARGET_API_MAC_CARBON] (mac_do_receive_drag): Likewise.  Reject
        only non-filename items.  Set event modifiers.  Set return value.

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