don't distribute negative extra space among box sizer items, this isn't useful as it results in overlapping windows (#10008)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/sizer.cpp

@@ -1939,6 +1939,12 @@ void wxBoxSizer::RecalcSizes()
 
         // adjust the size in the major direction using the proportion
         wxCoord majorSize = GetSizeInMajorDir(sizeThis);
+
+        // if there is not enough space, don't try to distribute negative space
+        // among the children, this would result in overlapping windows which
+        // we don't want
+        if ( delta > 0 )
+        {
             const int propItem = item->GetProportion();
             if ( propItem )
             {
@@ -1949,6 +1955,7 @@ void wxBoxSizer::RecalcSizes()
                 delta -= deltaItem;
                 totalProportion -= propItem;
             }
+        }
 
 
         // apply the alignment in the minor direction