with plastic scheme when Windows exists, panic happens

[Richie-Jang]

Hello,
First of all, Thank you.

using Windows 11, Mingw64 (GCC), Golang V1.22.5
I am trying to learn this library from examples.

If I set fltk.SetScheme("plastic"), Close the windows.. Process is still alive / checked on Task Manager.

I checked it with console.

Exception 0xc0000005 0x0 0x22d1d 0x7ffd428f1d65
PC=0x7ffd428f1d65

runtime: g 0 gp=0x7ff6a76807c0: unknown pc 0x7ffd428f1d65
stack: frame={sp:0xeecebff7f0, fp:0x0} stack=[0x0,0xeecebffd30)
0x000000eecebff6f0: 0x000000eecebff7e0 0x000000000f00000f
0x000000eecebff700: 0x00000253a5de0000 0x000000001d00001d
0x000000eecebff710: 0x0000000000000000 0x00007ffd438ac350
0x000000eecebff720: 0x0000000000000000 0x0000000000000001 ...

goroutine 1 gp=0xc00004a000 m=0 mp=0x7ff6a7680d80 [running]:
runtime.systemstack_switch()
C:/development/go/src/runtime/asm_amd64.s:474 +0x8 fp=0xc000077ed0 sp=0xc000077ec0 pc=0x7ff6a73eeae8
runtime.stdcall(0xc000064050?)
C:/development/go/src/runtime/os_windows.go:973 +0x7b fp=0xc000077f08 sp=0xc000077ed0 pc=0x7ff6a73c1abb
runtime.stdcall1(0x7ff6a7566e70, 0x0)
C:/development/go/src/runtime/os_windows.go:994 +0x56 fp=0xc000077f20 sp=0xc000077f08 pc=0x7ff6a73c1b76
runtime.exit(0x0?)
C:/development/go/src/runtime/os_windows.go:583 +0x45 fp=0xc000077f50 sp=0xc000077f20 pc=0x7ff6a73c09c5
runtime.main()
C:/development/go/src/runtime/proc.go:295 +0x2de fp=0xc000077fe0 sp=0xc000077f50 pc=0x7ff6a73c6c1e
runtime.goexit({})
C:/development/go/src/runtime/asm_amd64.s:1695 +0x1 fp=0xc000077fe8 sp=0xc000077fe0 pc=0x7ff6a73f0b01
.....

The other Scheme Gtk+ or gleam is fine.. No panic happens while Windows closing.

Could you please check this.

Best Regards,
Richie.

[pwiecz]

Hi, thanks for the report and sorry for the late response.
I can reproduce the problem, but so far I'm baffled by it, as I was unable to pinpoint the culprit of the issue. :(
We'll be looking more into it.

[pwiecz]

Only think so far I could tell that the panic seems to be related with the use of a tile background here:
https://github.com/fltk/fltk/blob/713f0b0f64992de8eace6f97d95f4d582f31d9ad/src/Fl_get_system_colors.cxx#L267
Removal of this line makes my test program not crash.

[Richie-Jang]

Thank you for the searching this problem & solution. Mainly It is caused from FLTK itself, not go binding library..

Thank you one more sharing such nice library.