Problem Interaction Between Fldigi and Xfce4
Robert G Snyder
bob at pathline.net
Mon Mar 6 06:18:43 CET 2023
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 https://groups.google.com/g/fltkgeneral/c/hcjV-rgjHWM
// read in the current window hints, then modify them to allow
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);
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.
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