mention that it may be impossible to set the size of a wxStaticLine in the transversal direction

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54794 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/statline.h

@@ -10,7 +10,12 @@
     @class wxStaticLine
 
     A static line is just a line which may be used in a dialog to separate the
-    groups of controls. The line may be only vertical or horizontal.
+    groups of controls.
+
+    The line may be only vertical or horizontal. Moreover, not all ports
+    (notably not wxGTK) support specifying the transversal direction of the
+    line (e.g. height for a horizontal line) so for maximial portability you
+    should specify it as wxDefaultCoord.
 
     @beginStyleTable
     @style{wxLI_HORIZONTAL}