Implement Fl_Scroll::on_insert()

This fixes the scrollbar order when children are inserted rather than
at some indefinite time later, for instance in draw().

This commit will very likely make Fl_Scroll::fix_scrollbar_order()
obsolete but this method is kept as is for tests and verification.

1 files changed, 2 insertions, 0 deletions

diff --git a/FL/Fl_Scroll.H b/FL/Fl_Scroll.H
index 9c5549e46..1d4934389 100644
--- a/FL/Fl_Scroll.H
+++ b/FL/Fl_Scroll.H
@@ -146,6 +146,8 @@ protected:      //  (STR#1895)
 
 protected:
 
+  virtual int on_insert(Fl_Widget*, int);
+  // virtual int on_move(int, int);         // Not (yet) implemented. Do we need this?
   void fix_scrollbar_order();
   void bbox(int&,int&,int&,int&) const;
   void draw();