[Fxruby-users] bug: descending FXTreeItem causes coredump?

[Kevin B. <kev...@sy...>]

To All,

I'm having a problem with using descedants of FXTreeItem.  Whatever is
causing the problem is hosing FXTreeList::removeItem.  

Environment: 
ruby 1.8.0 (2003-09-29) [i686-linux] (though I've used several 1.8
versions)
fox 1.0.46
FXRuby 1.0.26

Source that causes the bug is at the end of this message.

The problem appears in FXTreeList::removeItem, whenever a child item has
focus:

    // Deleted current item
    if(currentitem && item==olditem){
      if(hasFocus()){
        currentitem->setFocus(TRUE);
        }
      if((options&SELECT_MASK)==TREELIST_BROWSESELECT &&
currentitem->isEnabled()){
        selectItem(currentitem,notify);
        }
      }

currentItem->setFocus ends up calling an already destroyed object or
something.  I traced which pointers were being freed, and it looked
okay, so I'm not sure what's going on.  I'm guessing that memory is
getting trashed.

Any help on this would be appreciated.  I'm trying to get a
ruby/fox/FXRuby app completed very quickly.  My workaround right now is
to change the focus to another control in onCmdQuit.

Kevin

-------------------------
require 'fox'
include Fox

class MyTreeItem < FXTreeItem
end

class MyMainWindow < FXMainWindow
  def initialize(app)
    super(app, 'Bug', nil, nil, DECOR_ALL, 0, 0, 600, 400)
    tree = FXTreeList.new(self, 0, nil, 0,
TREELIST_NORMAL|TREELIST_SHOWS_LINES|TREELIST_SHOWS_BOXES|TREELIST_ROOT_BOXES|LAYOUT_FILL_X|LAYOUT_FILL_Y)
    item = tree.addItemLast(@tree, MyTreeItem.new('Select and close -
just fine'))
    item = tree.addItemLast(item, MyTreeItem.new('Select and close -
choke'))
  end
  def create
    super
    show(PLACEMENT_SCREEN)
  end
end

app = FXApp.new('bug', 'bugtest')
MyMainWindow.new(app)
app.create
app.run