SysTray and stdimages examples not work Under Linux

[benohb]

For a while c82999d
SysTray crash in show
stdimages examples Does not display icons

[graemeg]

Can you give more information about your Linux system? What desktop environment (KDE, Gnome 3, Gnome 2, Mate or some specific Window Manager (eg: jwm). What version of the distroy. I've got Ubuntu 18.04 running JWM and the systray example works fine here.

[benohb]

XUbuntu 18.04 64bit (xfce)
Lazarus 2.0 fpc 3.04 (last stable)
(SysTray crash)
"an unexpected error occurred invalid type cast"
In file 'fpg_x11.pas' at line 4466
FtrayWidget := AOwner as TfpgWindowBase;

---

(stdimages examples)
There is no error messages

---

Is this a normal thing ??? All versions before this change works fine (SysTray)

[fredvs]

Hello.

I did have the same problem with Raspian + xfce.
It was discussed (and solved) in fpGUINews-group, topic " fpGUI and RPi"

http://geldenhuys.co.uk/webnews/webnews.cgi?user=fredvs;showold=true;group=fpgui.support;sortorder=date;article=8200

Hello Graeme.

Well seen, the problem was indeed form that part of code.

Doing this in fpg_x11.pas around line 2406:

 { setup a window icon }

// IconPixMap := XCreateBitmapFromData(xapplication.display, FWinHandle,
// @IconBitmapBits, IconBitmapWidth, IconBitmapHeight);

 WMHints := XAllocWMHints;  // NOT comment this otherwise crash.  

// WMHints^.icon_pixmap := IconPixmap;
// WMHints^.flags := IconPixmapHint;

---> fix the problem of crash of the tray-panel.

The good news is that assigning for a form a custom icon (24 bit from .bpm
into resource) with "TfpgForm.IconName" works.
The icon is perfectly show and no crash with the tray-panel.

Fre;D

Maybe it can help you.

Fre;D

[graemeg]

I can finally reproduce the issue (if AggCanvas) is disabled. I have a good idea on how to solve this.... Due to desktop environments changing systray behaviour. Solution should be applied to to "develop" and "maint" branches in a day or two. Thanks for reporting it.

[benohb]

Thank you graemeg / fredvs