Bug: Exception when clicking on an empty Fl_Tabs with OVERFLOW_PULLDOWN

[pvr...@btinternet.com]

FLTK 1.4.4

I get an exception when clicking on an Fl_Tabs with no children. I have handle_overflow set to OVERFLOW_PULLDOWN. 

Trivial case attached.

Regards 

Phil Rose.

[Albrecht Schlosser]

On 2/26/26 14:54 'pvr...@XXXX.com' via fltk.general wrote:

FLTK 1.4.4

I get an exception when clicking on an Fl_Tabs with no children. I have handle_overflow set to OVERFLOW_PULLDOWN. 

Trivial case attached.

Thanks for the report and the demo, bug confirmed (currently using FLTK 1.5 / master).

When looking through the FLTK code (src/Fl_Tabs.cxx) I noticed that this is not the only crash when the Fl_Tabs widget has no children. Another crash happens when you use the mousewheel in the same demo program.

Phil, can you please file an official bug report (GitHub Issue) so this won't be forgotten? This needs further investigation.

TIA.

[pvr...@btinternet.com]

Issue #1366 raised.

Phil.

---

From: 'Albrecht Schlosser' via fltk.general <fltkg...@googlegroups.com>
Sent: Thursday, February 26, 2026 6:42 PM
To: fltkg...@googlegroups.com <fltkg...@googlegroups.com>
Subject: Re: [fltk.general] Bug: Exception when clicking on an empty Fl_Tabs with OVERFLOW_PULLDOWN

 

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[Albrecht Schlosser]

FTR:

On 2/26/26 22:25 'pvr...@btinternet.com' via fltk.general wrote:

Issue #1366 raised.

Thanks for filing the issue - meanwhile it was fixed by Matthias, thanks for that as well.

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