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This PR fixes an issue where a bad pivot stored in app state would
override the pivot actually set from code. The root code of this issue
if the `Window`'s `State` containing `pivot` in the first place, as
`pivot` is not part of a state to be tracked. It makes the `State`
structure more ergonomic though, so this PR leaves the `pivot` field but
always overrides it with the value provided by user code.
#### Repro of the original issue
This issue can be reproduced using the `re_ui_example` app from the
Rerun repo, at this commit:
fb5add0047.
By using this `app.ron` file, the bug will appear:
```
{
"egui": "(
areas:{
((0)):(
areas:{
(13430889033718688666):(pivot_pos:(x:565.5,y:328.0),pivot:((Min,Min)),size:(x:364.0,y:75.5),interactable:true),
},
)
}
)",
}
```
The modal is entered based on it's top-left corner even though the code
actually specifies a center-center pivot:
<img width="1312" alt="image"
src="https://github.com/emilk/egui/assets/49431240/6df1a8bb-d1ea-4e15-866c-5f14138dda0e">
With this PR, the centring is correct even with the "poisoned"
`app.ron`:
<img width="1312" alt="image"
src="https://github.com/emilk/egui/assets/49431240/7f50b2d4-9245-48f3-91de-c747bbc8c40e">
GUI implementation
This is the core library crate egui. It is fully platform independent without any backend. You give the egui library input each frame (mouse pos etc), and it outputs a triangle mesh for you to paint.