--- rxvt-unicode/src/screen.C	2006/01/25 21:09:21	1.252
+++ rxvt-unicode/src/screen.C	2006/01/30 04:27:17	1.255
@@ -128,7 +128,7 @@
 
   l.touch ();
 
-  efs &= ~RS_baseattrMask;
+  efs &= ~RS_baseattrMask; // remove italic etc. fontstyles
   efs = SET_FONT (efs, FONTSET (efs)->find_font (' '));
 
   text_t *et = l.t + col;
@@ -643,14 +643,18 @@
       // erase newly scrolled-in lines
       for (int i = count; i--; )
         {
-          // basically this is a slightly optimized scr_blank_screen_mem
-          // it is worth the effort on slower machines
           line_t &l = ROW(nrow - 1 - i);
 
-          scr_blank_line (l, 0, l.l, rstyle);
-
-          l.l = 0;
-          l.f = 0;
+          // optimize if already cleared, can be significant on slow machines
+          // could be rolled into scr_blank_screen_mem
+          if (l.r && l.l < ncol - 1 && !((l.r[l.l + 1] ^ rstyle) & RS_bgMask))
+            {
+              scr_blank_line (l, 0, l.l, rstyle);
+              l.l = 0;
+              l.f = 0;
+            }
+          else
+            scr_blank_screen_mem (l, rstyle);
         }
 
       // now copy lines below the scroll region bottom to the
@@ -1752,10 +1756,9 @@
 
   for (int i = 0; i < nrow; i++)
     {
-      int col = 0;
       rend_t *drp = drawn_buf[i].r;
 
-      for (; col < ncol; col++, drp++)
+      for (int col = 0; col < ncol; col++, drp++)
         if ((*drp & mask) == value)
           {
             found = true;
@@ -2256,11 +2259,11 @@
 
               // force redraw after "careful" characters to avoid pixel droppings
               for (int i = 0; srp[col + i] & RS_Careful && col + i < ncol - 1; i++)
-                drp[col + i + 1] = ~srp[col + i + 1];
+                drp[col + i + 1] = srp[col + i + 1] ^ RS_redraw;
 
               // force redraw before "careful" characters to avoid pixel droppings
               for (int i = 0; srp[text - stp - i] & RS_Careful && text - i > stp; i++)
-                drp[text - stp - i - 1] = ~srp[text - stp - i - 1];
+                drp[text - stp - i - 1] = srp[text - stp - i - 1] ^ RS_redraw;
 #endif
 
               bool invert = rend & RS_RVid;