On wayland ViewportCommand::InnerSize doesn't update the content size

[ColinKinloch]

Describe the bug

On wayland (mutter) when the window is resized using ViewportCommand::InnerSize the viewport size doesn't match the window.

Drag Resize Handle	Press "Phone Size"	Drag Resize Handle	Press "Desktop Size"

I suspect this is because winit doesn't send Resized events after the resize, the correct way to handle this is applying the value returned from request_inner_size to the viewport here:

egui/crates/egui-winit/src/lib.rs

Lines 1313 to 1322 in d449cb1

	ViewportCommand::InnerSize(size) => {
	let width_px = pixels_per_point * size.x.max(1.0);
	let height_px = pixels_per_point * size.y.max(1.0);
	if window
	.request_inner_size(PhysicalSize::new(width_px, height_px))
	.is_some()
	{
	log::debug!("ViewportCommand::InnerSize ignored by winit");
	}
	}

To Reproduce
Steps to reproduce the behavior:

1. On gnome shell press the Phone Size button, note the window contents are stretched
2. Resize the window, note the window contents are not stretched
3. Repeat

Expected behavior
Contents are not stretched

Screenshots

Desktop (please complete the following information):

• OS: Fedora 39

#4197 makes it easier to test.

[zeta0134]

I just ran into this bug today. Same behavior, this time on Arch+KDE. Only occurs in Wayland, the same device with an x11 session computes the dimensions correctly, even with DPI scaling applied.

[ColinKinloch]

The behaviour is documented here:
https://docs.rs/winit/latest/winit/window/struct.Window.html#method.request_inner_size