v0.4.0

• Panics in task::respond are now resumed in the response var modify closure.
• Add task::ipc module, for running tasks in worker processes.
• Breaking: Remove "bytemuck" feature from zng-unique-id.
  • Now must use impl_unique_id_bytemuck! to generate the impls.
  • Note that this is only a breaking change for direct dependents of zng-unique-id.
• Add single app-process instance mode.
  • Adds zng-ext-single-instance crate re-exported in zng::app when non-default
    Cargo feature "single_instance" is enabled.
• Implement AsRef<std::path::Path> for Txt.
• Implement AsRef<std::ffi::OsStr> for Txt.
• Add app-process crash handler.
  • Adds zng::app::crash_handler.
  • Can be used to easily implement crash reporting, stacktrace and minidump
    collection, app restart on crash.
  • Call zng::app::crash_handler::init_debug() to quickly setup panic and minidump collection.
• Fix view-process kill by user not working after respawn.
• Fix view-process assuming any signal kill was requested by the user.
• Fix potential issue retrieving current_exe trough symbolic links.
• Fix view-process panic message.
• Add APP.about.
• Fix AnsiText! not resetting style.
• Markdown! widget now uses AnsiText! for ```console code block.
• Fix auto_size not using the min/max_size constraints.
• Breaking: Change return type of SCROLL.vertical_offset, SCROLL.horizontal_offset and SCROLL.zoom_scale.
  • Changed only from ReadOnlyContextVar<Factor> to ContextVar<Factor> so it has minimal impact.
• Add vertical_offset, horizontal_offset and zoom_scale properties in Scroll!.
  • Users should prefer using scroll commands over these properties, but they are useful for implementing features
    like binding two side-by-side scrolls, saving scroll state.