[PATCH] fix motion event crash in pixel_to_glyph_translation()

Mike Kupfer wrote: Okay, after reviewing the redisplay and events code, plus some sessions with gdb, I came up with the following patch. I want to test it some more, but I thought I'd post it now in case someone sees something obviously bogus with it. mike PS. I wonder if the ChangeLog entry could use some tweaking. In particular, I wonder if the root cause was that the minibuffer was active in frame A, but the motion event was for frame B. (I use click-to-type to set input focus.) 2010-12-31 Mike Kupfer <mike.kupfer(a)xemacs.org&gt; * redisplay.c (pixel_to_glyph_translation): Handle the case where row and column are zero, and there aren't any runes. This can happen with motion events when entering a frame and the minibuffer is active. diff --git a/src/redisplay.c b/src/redisplay.c --- a/src/redisplay.c +++ b/src/redisplay.c ＠＠ -9154,19 +9154,27 ＠＠ for (*col = 0; *col <= Dynarr_length (db->runes); (*col)++) { - int past_end = (*col == Dynarr_length (db->runes)); - - if (!past_end) - rb = Dynarr_atp (db->runes, *col); - - if (past_end || - (rb->xpos <= x_coord && x_coord < rb->xpos + rb->width)) + if (*col == Dynarr_length (db->runes)) { - if (past_end) - { - (*col)--; - rb = Dynarr_atp (db->runes, *col); - } + /* We've run out of runes to look at. Treat the same as + the case below where we failed to find a non-glyph + character. */ + if (dl->modeline) + *modeline_closest = dl->end_charpos + dl->offset; + else + *closest = dl->end_charpos + dl->offset; + + if (check_margin_glyphs) + get_position_object (dl, obj1, obj2, x_coord, + &low_x_coord, &high_x_coord); + + UPDATE_CACHE_RETURN; + } + + rb = Dynarr_atp (db->runes, *col); + + if (rb->xpos <= x_coord && x_coord < rb->xpos + rb->width) + { *charpos = rb->charpos + dl->offset; low_x_coord = rb->xpos; ＠＠ -9240,9 +9248,8 ＠＠ UPDATE_CACHE_RETURN; } - else if (past_end - || (rb->type == RUNE_CHAR - && rb->object.chr.ch == '\n')) + else if (rb->type == RUNE_CHAR + && rb->object.chr.ch == '\n') { (*row)--; /* At this point we may have glyphs in the right _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://lists.xemacs.org/mailman/listinfo/xemacs-beta