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- We can't use the original "Show experimental features" checkbox implementation, because it *deeply* breaks Gradio.
- Gradio's `gr.Examples()` API binds itself to the original state of the user interface. Gradio crashes and causes various bugs if we try to change the available UI controls later.
- Instead, we must use `gr.Dataset()` which acts like a custom input/output control and doesn't directly bind itself to the target control. We must also provide a secret, hidden "all mode choices" component so that it knows the names of all "control modes" that are possible in examples.
- We now also have a very visible warning label in the user interface, to clearly mark the experimental features.
- Bugs fixed:
* The code was unable to toggle the visibility of Experimental demos in the Examples list. It was not possible with Examples (since it's a wrapper around Dataset, but Examples contains its own internal state/copy of all data). Instead, we use a Dataset and manipulate its list directly.
* Gradio crashes with a `gradio.exceptions.Error` exception if you try to load an example that tries to use an experimental feature if we have removed its UI element. This is because Examples binds to the original user interface and *remembers* the list of choices, and it *cannot* dynamically select something that did not exist when the `gr.Examples()` was initially created. This problem is fixed by switching to `gr.Dataset()`.
* Furthermore, Gradio's `gr.Examples()` handler actually remembers and caches the list of UI options. So every time we load an example, it rewrites the "Emotion Control Mode" selection menu to only show the options that were available when the Examples table was created. This means that even if we keep the "Show experimental features" checkbox, Gradio itself will erase the experimental mode from the Control Mode selection menu every time the user loads an example. There are no callbacks or "update" functions to allow us to override this automatic Gradio behavior. But by switching to `gr.Dataset()`, we completely avoid this deep binding.
* The "Show experimental features" checkbox is no longer tied to a column in the examples-table, to avoid fighting between Gradio's example table trying to set the mode, and the experimental checkbox being toggled and also trying to set the mode.
* Lastly, the "Show experimental features" checkbox now remembers and restores the user's current mode selection when toggling the checkbox, instead of constantly resetting to the default mode ("same as voice reference"), to make the UI more convenient for users.