message: Simplify style of `pane_grid` example
diff: @@ -97,16 +97,15 @@ impl Sandbox for Example {
  let pane_grid =
  PaneGrid::new(&mut self.panes, |pane, content, focus| {
  + let is_focused = focus.is_some();
  let title_bar =
  pane_grid::TitleBar::new(format!("Pane {}", content.id))
  .padding(10)
  - .style(style::TitleBar { focus });
  + .style(style::TitleBar { is_focused });
  pane_grid::Content::new(content.view(pane, total_panes))
  .title_bar(title_bar)
  - .style(style::Pane {
  - is_focused: focus.is_some(),
  - })
  + .style(style::Pane { is_focused })
  })
  .width(Length::Fill)
  .height(Length::Fill)
  @@ -229,7 +228,7 @@ impl Content {
  }
  mod style {
  - use iced::{button, container, pane_grid, Background, Color, Vector};
  + use iced::{button, container, Background, Color, Vector};
  const SURFACE: Color = Color::from_rgb(
  0xF2 as f32 / 255.0,
  @@ -250,13 +249,13 @@ mod style {
  );
  pub struct TitleBar {
  - pub focus: Option<pane_grid::Focus>,
  + pub is_focused: bool,
  }
  impl container::StyleSheet for TitleBar {
  fn style(&self) -> container::Style {
  let pane = Pane {
  - is_focused: self.focus.is_some(),
  + is_focused: self.is_focused,
  }
  .style();
  