Never restore focus to hidden child.

Don't set focus to a hidden window in our focus management code, this never
makes sense and results in apparent focus loss.

It also fixes, as a side effect, a crash in wxGrid under wxMSW as the focus is
not restored to the hidden grid editor any longer and so the code in its
wxEVT_KILL_FOCUS handler that resulted in the crash is not executed any
longer, see #13349.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68319 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/containr.cpp

@@ -650,14 +650,26 @@ bool wxSetFocusToChild(wxWindow *win, wxWindow **childLastFocused)
         // It might happen that the window got reparented
         if ( (*childLastFocused)->GetParent() == win )
         {
-            wxLogTrace(TRACE_FOCUS,
-                       wxT("SetFocusToChild() => last child (0x%p)."),
-                       (*childLastFocused)->GetHandle());
+            // And it also could have become hidden in the meanwhile, in this
+            // case focus its parent instead.
+            while ( !(*childLastFocused)->IsShown() )
+            {
+                *childLastFocused = (*childLastFocused)->GetParent();
+                if ( !*childLastFocused )
+                    break;
+            }
 
-            // not SetFocusFromKbd(): we're restoring focus back to the old
-            // window and not setting it as the result of a kbd action
-            (*childLastFocused)->SetFocus();
-            return true;
+            if ( *childLastFocused )
+            {
+                wxLogTrace(TRACE_FOCUS,
+                           wxT("SetFocusToChild() => last child (0x%p)."),
+                           (*childLastFocused)->GetHandle());
+
+                // not SetFocusFromKbd(): we're restoring focus back to the old
+                // window and not setting it as the result of a kbd action
+                (*childLastFocused)->SetFocus();
+                return true;
+            }
         }
         else
         {