Fix Fl_Tree::insert() with pos out ouf range (#18)

The given position to insert a new item was not checked  against the
valid range so the program  could crash if a position less than zero
or greater than children() was given. The position is now clamped to
the valid range, i.e. the item is either prepended or appended.

Fixes issue #18.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/Fl_Tree.cxx b/src/Fl_Tree.cxx
index a658a38c7..1b83dda96 100644
--- a/src/Fl_Tree.cxx
+++ b/src/Fl_Tree.cxx
@@ -874,6 +874,14 @@ Fl_Tree_Item* Fl_Tree::insert_above(Fl_Tree_Item *above, const char *name) {
 
 /**
  Insert a new item \p 'name' into \p 'item's children at position \p 'pos'.
+
+ If \p pos is out of range the new item is
+  - prepended if \p pos \< 0 or
+  - appended  if \p pos \> item->children().
+
+ Note: \p pos == children() is not considered out of range: the item is
+ appended to the child list.
+
  Example:
  \par
  \code