ensure Dataframes in background tabs are visible when the tab is selected

[pngwn]

Closes #7349.

See comment below for details.

[gradio-pr-bot]

🪼 branch checks and previews

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---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/061b0d62ea70201038830a5d9bf7e70d4963140f/gradio-4.17.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@061b0d62ea70201038830a5d9bf7e70d4963140f#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/app	patch
@gradio/dataframe	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

ensure Dataframes in background tabs are visible when the tab is selected

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[pngwn]

Alright, I think I have this working now:

Old:

Screen.Recording.2024-02-08.at.14.38.32.mov

New:

Screen.Recording.2024-02-09.at.15.41.48.mov

The issue was to do with heights not being reported correctly (or at all) for certain devices. I do not know why. It will remain forever a mystery.

I changed how we become notified of dimensions changes and that seems to have done the trick.

The CSS being broken is a separate issue.

If you have access to a device that didn't work then please try this preview: https://pngwn-7349-df-repro-fix.hf.space/

[pngwn]

This PR represents the least fun I've had in years. I might frame it as a reminder.

[pngwn]

Those test failures are weird but i can repro locally.

[abidlabs]

Brilliant @pngwn thanks for taking care of this!

[pngwn]

work pls