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+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.759
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.759
+Problem:    MS-Windows: Updating the tabline is slow when there are many tabs.
+Solution:   Disable redrawing while performing the update. (Arseny Kapoulkine)
+Files:	    src/gui_w48.c
+
+
+*** ../vim-7.3.758/src/gui_w48.c	2012-11-20 16:53:34.000000000 +0100
+--- src/gui_w48.c	2012-12-12 17:10:21.000000000 +0100
+***************
+*** 2452,2458 ****
+      TCITEM	tie;
+      int		nr = 0;
+      int		curtabidx = 0;
+-     RECT	rc;
+  #ifdef FEAT_MBYTE
+      static int	use_unicode = FALSE;
+      int		uu;
+--- 2452,2457 ----
+***************
+*** 2479,2491 ****
+      tie.mask = TCIF_TEXT;
+      tie.iImage = -1;
+  
+      /* Add a label for each tab page.  They all contain the same text area. */
+      for (tp = first_tabpage; tp != NULL; tp = tp->tp_next, ++nr)
+      {
+  	if (tp == curtab)
+  	    curtabidx = nr;
+  
+! 	if (!TabCtrl_GetItemRect(s_tabhwnd, nr, &rc))
+  	{
+  	    /* Add the tab */
+  	    tie.pszText = "-Empty-";
+--- 2478,2493 ----
+      tie.mask = TCIF_TEXT;
+      tie.iImage = -1;
+  
++     /* Disable redraw for tab updates to eliminate O(N^2) draws. */
++     SendMessage(s_tabhwnd, WM_SETREDRAW, (WPARAM)FALSE, 0);
++ 
+      /* Add a label for each tab page.  They all contain the same text area. */
+      for (tp = first_tabpage; tp != NULL; tp = tp->tp_next, ++nr)
+      {
+  	if (tp == curtab)
+  	    curtabidx = nr;
+  
+! 	if (nr >= TabCtrl_GetItemCount(s_tabhwnd))
+  	{
+  	    /* Add the tab */
+  	    tie.pszText = "-Empty-";
+***************
+*** 2519,2529 ****
+      }
+  
+      /* Remove any old labels. */
+!     while (TabCtrl_GetItemRect(s_tabhwnd, nr, &rc))
+  	TabCtrl_DeleteItem(s_tabhwnd, nr);
+  
+      if (TabCtrl_GetCurSel(s_tabhwnd) != curtabidx)
+  	TabCtrl_SetCurSel(s_tabhwnd, curtabidx);
+  }
+  
+  /*
+--- 2521,2534 ----
+      }
+  
+      /* Remove any old labels. */
+!     while (nr < TabCtrl_GetItemCount(s_tabhwnd))
+  	TabCtrl_DeleteItem(s_tabhwnd, nr);
+  
+      if (TabCtrl_GetCurSel(s_tabhwnd) != curtabidx)
+  	TabCtrl_SetCurSel(s_tabhwnd, curtabidx);
++ 
++     /* Re-enable redraw. This should trigger a repaint. */
++     SendMessage(s_tabhwnd, WM_SETREDRAW, (WPARAM)TRUE, 0);
+  }
+  
+  /*
+*** ../vim-7.3.758/src/version.c	2012-12-12 16:43:52.000000000 +0100
+--- src/version.c	2012-12-12 17:10:46.000000000 +0100
+***************
+*** 727,728 ****
+--- 727,730 ----
+  {   /* Add new patch number below this line */
++ /**/
++     759,
+  /**/
+
+-- 
+hundred-and-one symptoms of being an internet addict:
+148. You find it easier to dial-up the National Weather Service
+     Weather/your_town/now.html than to simply look out the window.
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
+///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\  an exciting new programming language -- http://www.Zimbu.org        ///
+ \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///