v0.4.0

Breaking Changes

• Dependency kludgine has been updated to v0.10.0, which updates Cushy to
  wgpu v22.0.0 and cosmic-text v0.12.0.
• At some point, a dependency of the image crate has been updated with a
  minimum supported Rust version (MSRV) of 1.80.0. This is Cushy's new MSRV to
  reflect this requirement.
• Source::for_each_* now invoke the callback with the current contents of of
  the source before attaching the callback. New functions beginning with
  for_each_subsequent_ have been added with the original behavior.
• CushyWindowBuilder has been renamed to StandaloneWindowBuilder and
  MakeWidget::build_virtual_window has been renamed to
  build_standalone_window.
• All animation easing related functionality has been reactored into a separate
  crate: easing-function. Most code will remain unaffected due to re-exports,
  but the Easing trait no longer accepts a ZeroToOne parameter, instead
  accepting an f32 value.

Fixed

• Fixed a panic that could occur when removing certain nested hierarchies from a
  window.

• CallbackHandle now has a must_use hint that might help users discover the
  persist function.

• Fixed a deadlock that could occur when multiple threads were attempting to
  execute change callbacks for the same dynamic at the same time.

• The initial inner_size of a Window is now used if it is non-zero and
  WindowAttributes::inner_size is None.

• Container's layout and drawing functions now properly round up/down the
  measurements to ensure accurate rendering. Fixes #158.

• Input selection handling when dragging below or above the text field is now
  handled correctly.

• Nested hierarchies of widgets stored in a reused WidgetInstance are now
  properly unmounted and remounted. For widgets that store MountedWidgets, in
  their mounted events the widgets should remount their children if needed.

  This fix not only fixes underlying issues with how unmounting was occuring,
  but also fixes Stack, Grid, and WidgetRef to automatically remount as
  needed.

Added

• AnimationRecorder::animate_keypress is a new helper that animates a single
  key press.
• AnimationRecorder::animate_mouse_button is a new helper that animates a
  single mouse button press and release.
• Window::on_close_requested is a new function that allows providing a
  callback that is invoked before the window is closed when the user or
  operating system requests that a window is closed. If the callback returns
  true, the window is allowed to be closed. If false is returned, the window
  will remain open. This feature is most commonly used to prevent losing unsaved
  changes.
• Fraction now has LinearInterpolation and PercentBetween implementations.
• Window::zoom allows setting a Dynamic<Fraction> that scales all DPI-scaled
  operations by an additional scaling factor.
• Edges and ContainerShadow now implement figures::Round.