Allow UI to update while markdown.update is in progress

Textualize / textual

The lean application framework for Python. Build sophisticated user interfaces with a simple Python API. Run your apps in the terminal and a web browser.

https://textual.textualize.io/

MIT License

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Allow UI to update while markdown.update is in progress #4589

Closed willmcgugan closed 1 month ago

willmcgugan commented 1 month ago

Fixes https://github.com/Textualize/textual/issues/4586

Runs blocking operations in a thread
Mounts widgets in batches
Micro-optimizations

This is unlikely to make very large markdown files any faster, but it should allow the UI to remain responsive while the update is happening.