Don't set the initial size as minimal size for top level windows.

Correct the change of r62814: only call SetMinSize() for non-top-level windows
as the user should be able to resize the top-level ones to be smaller than
their initial size.

This also fixes the GTK+ warning resulting from calling wxTLW::SetMinSize()
from the ctor, before the window is realized.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62817 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/wincmn.cpp

@@ -241,8 +241,10 @@ bool wxWindowBase::CreateBase(wxWindowBase *parent,
 
     // assume the user doesn't want this window to shrink beneath its initial
     // size, this worked like this in wxWidgets 2.8 and before and generally
-    // often makes sense
-    SetMinSize(size);
+    // often makes sense for child windows (for top level ones it definitely
+    // does not as the user should be able to resize the window)
+    if ( !wxTopLevelWindows.Find(this) ) // can't use IsTopLevel() from ctor
+        SetMinSize(size);
 
     SetName(name);
     SetParent(parent);