* xdisp.c (produce_glyphless_glyph): Initialize lower_xoff.

Add a FIXME comment, since the code still doesn't look right.

src/ChangeLog

 2011-03-06  Paul Eggert  <eggert@cs.ucla.edu>
+	* xdisp.c (produce_glyphless_glyph): Initialize lower_xoff.
+	Add a FIXME comment, since the code still doesn't look right.
+
 	current_column: Now returns EMACS_INT, fixing some iftc.
 	* bytecode.c (Fbyte_code): Don't cast current_column () to int.
 	* cmds.c (internal_self_insert): Likewise.
@@ -10,6 +13,7 @@
 	to int.
 	* xdisp.c (redisplay_internal, redisplay_window, decode_mode_spec):
 	Likewise.
+
 	* cmds.c (internal_self_insert): Declare locals to be EMACS_INT,
 	not int or double, if they might contain a column number.
 	* indent.c (current_column, Findent_to, indented_beyond_p):

src/xdisp.c

@@ -22292,7 +22292,13 @@ produce_glyphless_glyph (struct it *it, int for_no_font, Lisp_Object acronym)
 	  if (metrics_upper.width >= metrics_lower.width)
 	    lower_xoff = (width - metrics_lower.width) / 2;
 	  else
-	    upper_xoff = (width - metrics_upper.width) / 2;
+	    {
+	      /* FIXME: This code doesn't look right.  It formerly was
+		 missing the "lower_xoff = 0;", which couldn't have
+		 been right since it left lower_xoff uninitialized.  */
+	      lower_xoff = 0;
+	      upper_xoff = (width - metrics_upper.width) / 2;
+	    }
 	}
       /* +5 is for horizontal bars of a box plus 1-pixel spaces at