Problem Interaction Between Fldigi and Xfce4

Gaël Bonithon trash.paradise at
Mon Mar 6 19:46:32 CET 2023


Please open bug reports against the affected components [1, 2], with complete backtraces of the crash, since it might be difficult to reproduce, at least for me.



------- Original Message -------
On Monday, March 6th, 2023 at 5:18 AM, Robert G Snyder <bob at> wrote:

> Recently, a change to the code in fldigi, a popular, cross platform, amateur radio digital mode application caused xfwm4 and xfce4-panel running on Arm (RPi 4B) under debian bullseye 64-bit to crash. No problems on Intel systems. The initial reaction was that something got broken in fldigi.
> However, when testing with LXDE desktop manager and LXPanel 0.10.1 and also MATE desktop manager, no problems were encountered. So our best conclusion for now is that the problem is in Xfce4.
> Note that fldigi uses fltk for GUI functionality. Dave Freese, the primary developer of fldigi, has isolated the code in fldigi that triggers the problem:
> // See
> // read in the current window hints, then modify them to allow icon transparency
> Pixmap mask = -1;
> XWMHints* hints = XGetWMHints(fl_display, fl_xid(arqwin));
> hints->flags |= IconMaskHint; // ensure transparency mask is enabled for the XPM icon
> hints->icon_mask = mask; // set the transparency mask
> XSetWMHints(fl_display, fl_xid(arqwin), hints);
> XFree(hints);
> Although Dave has a workaround, we are hoping that the problem can be found or at least we can work together to fix this. fldigi is under GPL Ver 3. Versions with and without the problem are available.
> Thanks,
> Bob
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