* dispextern.h (struct glyph_string): New members clip_head and
clip_tail. * xdisp.c (get_glyph_string_clip_rect): Restrict horizontal clip region to the area between clip_head and clip_tail. (draw_glyphs): Record the area that need to be actually redrawn to the new variables clip_head and clip_tail when there are overhangs. Set values of these variables to the corresponding members in struct glyph_string. Refine x coordinates for * macgui.h (STORE_XCHARSETSTRUCT): New macro. * macterm.c (mac_compute_glyph_string_overhangs): Implement with QDTextBounds. (x_draw_glyph_string): Don't fill the background of the successor of a glyph with a right overhang if the successor will draw a cursor. (XLoadQueryFont): Obtain font metrics using QDTextBounds. (x_redisplay_interface): Add entry for compute_glyph_string_overhangs.
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