Problem with TListBox

[Bandbaz]

Hi
I tried to compile something on 2 systems. But I had different results.
Both: Ubuntu 9.10, fpc 2.2.4-3, Lazarus 0.9.28.2-0
The only difference i think is: one of them is 32bit and the other one is 64

Add ListBox1 and Button1 to a Form.
Add some items to ListBox1
Set Button1.Onclick to

Code: [Select]

ListBox1.ClearSelection;or

Code: [Select]

ListBox1.ItemIndex:=-1;or

Code: [Select]

ListBox1.Selected[ListBox1.ItemIndex]:=false;
Clicking the button should deselect ListBox items.

It works on my 64bit system.
But on 32bit system, after clicking the button nothing happens and then if I click again on one of the items on ListBox, I will have 2 Items selected! (and it doesn't depend on MultiSelection)

Any idea?
Have you had this experience?
How it works on other systems?

[theo]

Have you had this experience?

Yes, I can reproduce this on Lazarus 0.9.29 r22524M FPC 2.2.4 i386-linux-gtk 2

-> bugtracker.

[JimR]

I selected an item in the listbox and checked all 3 of your lines of code on:
Version #:0.9.28.2 beta
Windows 7  32-bit

In all 3 cases the selected (highlighted) item was deselected.