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Falkon crash under Wayland.
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When launching Falkon under Plasma Wayland (I know, it's not officially supported) it crashes.

$ falkon 
Using Wayland-EGL
WebEngine compiled with X11 support, however qpa backend is not xcb. This may fail.
[0924/] Failed to open file: /home/user/#2243869 (deleted)
  Error: No such file or directory
[2671:2698:0924/224932.571847:ERROR:gl_surface_qt.cpp(230)] eglGetProcAddress not found.
Falkon: 1 extensions loaded
Using the 'xdg-shell-v6' shell integration
qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
[2671:2698:0924/224932.848279:ERROR:gl_surface_qt.cpp(299)] Requested OpenGL implementation is not supported. Implementation: 0
*** stack smashing detected ***: <unknown> terminated
Received signal 6
#0 0x7f5d8f13594e <unknown>
#1 0x7f5d8dabe486 <unknown>
#2 0x7f5d8f135e37 <unknown>
#3 0x7f5d94470ef0 <unknown>
#4 0x7f5d94470e67 gsignal
#5 0x7f5d94452515 abort
#6 0x7f5d944b9316 <unknown>
#7 0x7f5d9455c3a1 <unknown>
#8 0x7f5d9455c362 __stack_chk_fail
#9 0x7f5d8db0d920 <unknown>
#10 0x7f5d8fc0fcfd <unknown>
#11 0x7f5d91b1b541 <unknown>
#12 0x7f5d91b1e51e <unknown>
#13 0x7f5d91b19b5b <unknown>
#14 0x7f5d91b175a5 <unknown>
#15 0x7f5d91b189ba <unknown>
#16 0x7f5d91b1a7c5 <unknown>
#17 0x7f5d8f13601f <unknown>
#18 0x7f5d8f158872 <unknown>
#19 0x7f5d8f1591b5 <unknown>
#20 0x7f5d8f159327 <unknown>
#21 0x7f5d8f1549c1 <unknown>
#22 0x7f5d8f17be6b <unknown>
#23 0x7f5d8f19fbcf <unknown>
#24 0x7f5d8f19b5b1 <unknown>
#25 0x7f5d8c808091 <unknown>
#26 0x7f5d94549eff clone
  r8: 0000000000000000  r9: 00007f5d3b7fc4c0 r10: 0000000000000008 r11: 0000000000000246
 r12: 00007f5d3b7fc760 r13: 0000000000001000 r14: 00007f5d70192000 r15: 0000000000000020
  di: 0000000000000002  si: 00007f5d3b7fc4c0  bp: 00007f5d3b7fc8a0  bx: 00007f5d3b7fc760
  dx: 0000000000000000  ax: 0000000000000000  cx: 00007f5d94470e67  sp: 00007f5d3b7fc4c0
  ip: 00007f5d94470e67 efl: 0000000000000246 cgf: 002b000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.
DataDrake triaged this task as Normal priority.
DataDrake added a subscriber: DataDrake.

Webengine has never liked wayland for a long time, I don't think that has changed. Does this still persist after the latest updates?

Also does running this from the command line change the outcome?

QT_QPA_PLATFORM=xcb falkon

Odd, I use Falkon on Wayland and have had no issues :/

Does this still persist with and without setting the above QPA_PLATFORM theme.