--- mozilla/gfx/src/gtk/nsFontMetricsXft.cpp.orig	2006-08-17 00:57:50 +0400
+++ mozilla/gfx/src/gtk/nsFontMetricsXft.cpp	2006-08-17 01:02:04 +0400
@@ -2189,19 +2189,27 @@
 nsAutoDrawSpecBuffer::Flush()
 {
     if (mSpecPos) {
-        // Some Xft libraries will crash if none of the glyphs have any
-        // area.  So before we draw, we scan through the glyphs.  If we
-        // find any that have area, we can draw.
-        for (PRUint32 i = 0; i < mSpecPos; i++) {
-            XftGlyphFontSpec *sp = &mSpecBuffer[i];
-            XGlyphInfo info;
-            XftGlyphExtents(GDK_DISPLAY(), sp->font, &sp->glyph, 1, &info);
-            if (info.width && info.height) {
-                // If we get here it means we found a drawable glyph.  We will
-                // Draw all the remaining glyphs and then break out of the loop
-                XftDrawGlyphFontSpec(mDraw, mColor, mSpecBuffer+i, mSpecPos-i);
-                break;
+        // There are two Xft problems to work around here:
+        // 1.  Some Xft libraries reportedly crash if none of the
+        //     glyphs have any area.
+        // 2.  Because of an apparent X server bug (see bug 252033),
+        //     a glyph with no area may cause all following glyphs to be
+        //     dropped under some circumstances.
+        // For this reason, we manually ship out blocks of glyphs with
+        // area and skip blocks of glyphs with no area.
+        PRUint32 start = 0;
+        while (start < mSpecPos) {
+            PRUint32 i;
+            for (i = start; i < mSpecPos; i++) {
+                XftGlyphFontSpec *sp = &mSpecBuffer[i];
+                XGlyphInfo info;
+                XftGlyphExtents(GDK_DISPLAY(), sp->font, &sp->glyph, 1, &info);
+                if (!info.width || !info.height)
+                    break;
             }
+            if (i > start)
+                XftDrawGlyphFontSpec(mDraw, mColor, mSpecBuffer+start, i-start);
+            start = i + 1;
         }
         mSpecPos = 0;
     }