Fix visibility issues associated with a window destroy.

src/gwin/class_gwin.h

@@ -211,7 +211,7 @@ typedef enum GRedrawMethod { REDRAW_WAIT, REDRAW_NOWAIT, REDRAW_INSESSION }	GRed
 /**
  * @brief	Flush any pending redraws in the system.
  *
- * @param[in]	doWait		Do we wait for the lock?
+ * @param[in]	how		Do we wait for the lock?
  *
  * @note	This call will attempt to flush any pending redraws
  * 			in the system. The doWait parameter tells this call
@@ -242,6 +242,20 @@ bool_t _gwinDrawStart(GHandle gh);
  */
 void _gwinDrawEnd(GHandle gh);
 
+/**
+ * @brief	Flush any pending redraws in the system.
+ *
+ * @param[in]	gh		The window
+ * @param[in]	how		Do we wait for the lock?
+ *
+ * @note	This call will delete the window. If called without the
+ * 			drawing lock 'how' must be REDRAW_WAIT. If called with the drawing
+ * 			lock 'how' must be REDRAW_INSESSION.
+ *
+ * @notapi
+ */
+void _gwinDestroy(GHandle gh, GRedrawMethod how);
+
 /**
  * @brief	Add a window to the window manager and set its position and size
  * @return	TRUE if successful

src/gwin/gwin.c

@@ -152,13 +152,16 @@ GHandle gwinGWindowCreate(GDisplay *g, GWindowObject *pgw, const GWindowInit *pI
 	return pgw;
 }
 
-void gwinDestroy(GHandle gh) {
+void _gwinDestroy(GHandle gh, GRedrawMethod how) {
 	if (!gh)
 		return;
 
 	// Make the window invisible
 	gwinSetVisible(gh, FALSE);
 
+	// Make sure it is flushed first - must be REDRAW_WAIT or REDRAW_INSESSION
+	_gwinFlushRedraws(how);
+
 	#if GWIN_NEED_CONTAINERS
 		// Notify the parent it is about to be deleted
 		if (gh->parent && ((gcontainerVMT *)gh->parent->vmt)->NotifyDelete)
@@ -182,6 +185,10 @@ void gwinDestroy(GHandle gh) {
 		gh->flags = 0;							// To be sure, to be sure
 }
 
+void gwinDestroy(GHandle gh) {
+	_gwinDestroy(gh, REDRAW_WAIT);
+}
+
 const char *gwinGetClassName(GHandle gh) {
 	return gh->vmt->classname;
 }