Add auto_shrink() function to egui::Window

[rustbasic]

Add auto_shrink() function to egui::Window

[emilk]

From the docs of ScrollArea::auto_shrink:

• If true, egui will add blank space outside the scroll area.
• If false, egui will add blank space inside the scroll area.

For a window we never want blank space outside the scroll area, so we should just change the default of Window::scroll to always have .auto_shrink(false)

[rustbasic]

I didn't fully understand what you meant.

This doesn't seem to be clearly explained in ScrollArea::auto_shrink.

If we want to change the default value of egui::Window,

1. we can either change the default value of ScrollArea::auto_shrink to false,

OR

2. add an auto_shrink variable to egui::Window.

I am unsure of which option is the best approach.

[emilk]

In Window::new do scroll: ScrollArea::neither().auto_shrink(false)

[emilk]

and now you can remove this

[emilk]

Suggested change

	/// If there is [`ScrollArea`], For each axis, should the containing area shrink if the content is small?
	#[inline]
	pub fn auto_shrink(mut self, auto_shrink: impl Into<Vec2b>) -> Self {
	self.scroll = self.scroll.auto_shrink(auto_shrink);
	self
	}

[rustbasic]

The new code you suggested is the same as the original one. There seems to be no changes in the suggestion.