Correct an NX error that would leave stuff on the display when a window is closed

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3769 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -1892,3 +1892,6 @@
 	* graphics/nxbe/nxbe_move.c: Fixed an error in the graphics move logic (This
 	  was a previously untested interface).  Basically, there is some confusion
 	  between use of (x,y) as a relative offset or as an absolute position.
+	* graphics/nxbe/nxbe_close.c:  Fixed an important graphics system bug:
+	  When a window is closed, the display was not being updated.  The old
+	  window graphic was left on the display for a time.

TODO

@@ -14,7 +14,7 @@ nuttx/
   (2)  USB (drivers/usbdev, drivers/usbhost)
   (6)  Libraries (lib/)
  (13)  File system/Generic drivers (fs/, drivers/)
-  (2)  Graphics subystem (graphics/)
+  (1)  Graphics subystem (graphics/)
   (1)  Pascal add-on (pcode/)
   (1)  Documentation (Documentation/)
   (4)  Build system / Toolchains
@@ -484,10 +484,6 @@ o Graphics subystem (graphics/)
   Status:      Open
   Priority:    Medium
 
-  Description: When a window is closed, the display is not updated.
-  Status:      Open
-  Priority:    High
-
 o Pascal Add-On (pcode/)
   ^^^^^^^^^^^^^^^^^^^^^^
 

graphics/nxbe/nxbe_closewindow.c

@@ -104,7 +104,7 @@ void nxbe_closewindow(struct nxbe_window_s *wnd)
 
   if (wnd->above)
     {
-      /* Yes, now the window below that on is the window below
+      /* Yes, now the window below that one is the window below
        * the one being closed.
        */
 
@@ -126,5 +126,12 @@ void nxbe_closewindow(struct nxbe_window_s *wnd)
    */
 
   wnd->below->above = wnd->above;
+
+  /* Redraw the windows that were below us (and may now be exposed) */
+
+  nxbe_redrawbelow(be, wnd->below, &wnd->bounds);
+
+  /* Then discard the window structure */
+
   free(wnd);
 }