don't take the min size into account when setting the window size explicitly in wxGTK, just as wxMSW doesn't do it; mention this in the docs and added a unit test to enforce this

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53741 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -2419,8 +2419,6 @@ void wxWindowGTK::DoSetSize( int x, int y, int width, int height, int sizeFlags
     if (height != -1)
         m_height = height;
 
-    ConstrainSize();
-
     if (m_parent->m_wxwindow)
     {
         wxPizza* pizza = WX_PIZZA(m_parent->m_wxwindow);