Arrange to tell redisplay about changes in overlays.
* xdisp.c (redisplay_region): New function. * buffer.c (Fmove_overlay): Call redisplay_region on the areas the overlay has enclosed or left. (Fdelete_overlay): Call redisplay_region on the area the overlay used to occupy. (Foverlay_put): Call redisplay_region on the area the overlay now occupies; we may have put a face property on it. * xdisp.c (redisplay): If we're doing a thorough redisplay (all windows on all frames involved), go ahead and flush the GC cache - call clear_face_vector. * xdisp.c (display_text_line): Apply faces to characters according to overlays and text properties; use compute_char_face and compute_glyph_face to figure out what face to use, and where a new face starts. * xterm.c (dumpglyphs): Use the upper bits of the glyphs to decide which frame face to use. Call GLYPH_FOLLOW_ALIASES to make sure we're implementing the glyph table properly. If we're not using the default or mode line face, call intern_face to find a display face for the frame face selected by the glyph code. Implement underlining. Remove the `font' argument; we have to derive this from the frame and face anyway. Change all callers. * disptab.h (GLYPH_FOLLOW_ALIASES): New macro.
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