--- rxvt-unicode/src/screen.C	2011/07/08 00:08:40	1.388
+++ rxvt-unicode/src/screen.C	2011/11/15 18:23:46	1.402
@@ -205,7 +205,7 @@
       talloc = new rxvt_salloc (ncol * sizeof (text_t));
       ralloc = new rxvt_salloc (ncol * sizeof (rend_t));
 
-      row_buf   = (line_t *)rxvt_calloc (total_rows + nrow, sizeof (line_t));
+      row_buf   = (line_t *)rxvt_calloc (total_rows       , sizeof (line_t));
       drawn_buf = (line_t *)rxvt_calloc (nrow             , sizeof (line_t));
       swap_buf  = (line_t *)rxvt_calloc (nrow             , sizeof (line_t));
 
@@ -277,7 +277,7 @@
         }
 
       line_t *old_buf = row_buf;
-      row_buf = (line_t *)rxvt_calloc (total_rows + nrow, sizeof (line_t));
+      row_buf = (line_t *)rxvt_calloc (total_rows, sizeof (line_t));
 
       int p    = MOD (term_start + prev_nrow, prev_total_rows);  // previous row
       int pend = MOD (term_start + top_row  , prev_total_rows);
@@ -646,7 +646,7 @@
 
       // sever bottommost line
       {
-        line_t &l = ROW(row2 - 1);
+        line_t &l = ROW(row2);
         l.is_longer (0);
         l.touch ();
       }
@@ -684,19 +684,14 @@
         }
 
       // move and/or clear selection, if any
-      if (selection.op && current_screen == selection.screen)
+      if (selection.op && current_screen == selection.screen
+          && selection.beg.row <= row2)
         {
           selection.beg.row  -= count;
           selection.end.row  -= count;
           selection.mark.row -= count;
 
-          if (selection.beg.row < top_row
-              || selection.end.row < top_row
-              || selection.mark.row < top_row)
-            {
-              CLEAR_ALL_SELECTION ();
-              selection.op = SELECTION_CLEAR;
-            }
+          selection_check (0);
         }
 
       // finally move the view window, if desired
@@ -736,11 +731,19 @@
       // use a simple and robust scrolling algorithm, this
       // part of scr_scroll_text is not time-critical.
 
+      // sever line above scroll region
+      if (row1)
+        {
+          line_t &l = ROW(row1 - 1);
+          l.is_longer (0);
+          l.touch ();
+        }
+
       int rows = row2 - row1 + 1;
 
       min_it (count, rows);
 
-      line_t *temp_buf = row_buf + total_rows;
+      line_t *temp_buf = rxvt_temp_buf<line_t> (rows);
 
       for (int row = 0; row < rows; row++)
         {
@@ -752,6 +755,13 @@
 
       for (int row = 0; row < rows; row++)
         ROW(row1 + row) = temp_buf [row];
+
+      // sever bottommost line
+      {
+        line_t &l = ROW(row2);
+        l.is_longer (0);
+        l.touch ();
+      }
     }
 
   return count;
@@ -2550,7 +2560,7 @@
         XSetWindowBackgroundPixmap (dpy, scrollBar.win, ParentRelative);
       else
         XSetWindowBackground (dpy, scrollBar.win, pix_colors[Color_border]);
-      scrollBar.state = STATE_IDLE;
+      scrollBar.state = SB_STATE_IDLE;
       scrollBar.show (0);
     }
 
@@ -2683,12 +2693,12 @@
 void
 rxvt_term::selection_check (int check_more) NOTHROW
 {
-  row_col_t pos;
-
   if (!selection.op)
     return;
 
+  row_col_t pos;
   pos.row = pos.col = 0;
+
   if (!IN_RANGE_EXC (selection.beg.row, top_row, nrow)
       || !IN_RANGE_EXC (selection.mark.row, top_row, nrow)
       || !IN_RANGE_EXC (selection.end.row, top_row, nrow)
@@ -2700,11 +2710,8 @@
           && ROWCOL_IS_BEFORE (selection.beg, pos)
           && ROWCOL_IS_AFTER (selection.end, pos))
       || (check_more == 3
-          && ROWCOL_IS_AFTER (selection.end, pos))
-      || (check_more == 4     /* screen width change */
-          && (selection.beg.row != selection.end.row
-              || selection.end.col > ncol)))
-    CLEAR_SELECTION ();
+          && ROWCOL_IS_AFTER (selection.end, pos)))
+    CLEAR_ALL_SELECTION ();
 }
 
 /* ------------------------------------------------------------------------- */