Uncheckable check boxes in a scrolling area

[Franck Barbenoire]

Hello all,

I noticed a problem involving Fl_Scroll and a list of check boxes. I don't know whether this is a bug or a misuse.

When there's no scroll, all visible check boxes can be checked and unchecked.

When I scroll down to the bottom of the list and scroll up to the begining of the list:

•  all the items that were hidden during the scroll and now visible again cannot be checked except the first;
• if I check the first, it enables the second to be checked;
• if I check the second, it enables the second to be checked, and so on;
• all the items that were not hidden during the scroll are checkable and this enables all the hidden ones to be checked.

I use Fltk-1.4.2 installed from sources on a Linux Mint 22.1 distribution.
Compiler version : g++ (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0

Thank you for your attention