After the #4284 update, Viewport graphics are broken.

[rustbasic]

@emilk

After the

• eframe: Early-out from context switching the glow backend #4284
  update,

if you run \examples\demo_viewports and open all Viewports,
Viewport graphics are broken.

egui Version : Master

[emilk]

When I run cargo r -p test_viewport on my Mac, everything works as intended.

If it is broken for you, tell me how and on what platform

[rustbasic]

When I run cargo r -p test_viewport on my Mac, everything works as intended.

If it is broken for you, tell me how and on what platform

run \examples\demo_viewports
and open all Viewports,
Viewport graphics are broken.

egui Version : Master
OS : Windows 10

[emilk]

HOW is it broken?

Does it crash?
Is the windows transparent?
Are they flickering?

[rustbasic]

HOW is it broken?

Does it crash? Is the windows transparent? Are they flickering?

crash with flickering.

[YgorSouza]

For the record, here is what it looks like on Windows 11 (strobe warning):

egui_test_viewports_bug.webm

#4296 does fix it.