Crash loading export dialog

[0HyperCube]

Reproduction

• Open https://dev.graphite.art/
• Create a new document with default artboard
• Select file->export
• Set the bounds to "Artboard"
• Cancel the export
• Delete the artboard (go to artboard tool, select artboard, press Del)
• Select file->export again
• Crash

panicked at editor/src/messages/dialog/export_dialog/export_dialog_message_handler.rs:125:99:
called `Option::unwrap()` on a `None` value

Video of reproduction

crash_export.mp4

Code

Dialogue state is stored globally for the editor and is not reset when the dialogue is closed.

Graphite/editor/src/dispatcher.rs

Line 25 in 42440c0

dialog_message_handler: DialogMessageHandler,

The dialogue assumes that the selected artboard LayerNodeIdentifier will continue to exist, and panics if this is not the case.

Graphite/editor/src/messages/dialog/export_dialog/export_dialog_message_handler.rs

Line 125 in 42440c0

let index = choices.iter().flatten().position(|(bounds, _, _)| *bounds == current_bounds).unwrap();

[Annonnymmousss]

I opened PR #3577