This PR adds a `map` method to the `Component` trait.
`map` is a fully-generalized form of `when`, as `when` can be expressed
in terms of `map`:
```rs
div().map(|this| if condition { then(this) } else { this })
```
This allows us to take advantage of Rust's pattern matching when
building up conditions:
```rs
// Before
div()
.when(self.current_side == PanelSide::Left, |this| this.border_r())
.when(self.current_side == PanelSide::Right, |this| {
this.border_l()
})
.when(self.current_side == PanelSide::Bottom, |this| {
this.border_b().w_full().h(current_size)
})
// After
div()
.map(|this| match self.current_side {
PanelSide::Left => this.border_r(),
PanelSide::Right => this.border_l(),
PanelSide::Bottom => this.border_b().w_full().h(current_size),
})
```
Release Notes:
- N/A
Marshall Bowers
ec0cff0e1a