[MDL bug for info] Cannot dynamically add Tabs

This is for information for anyone else pulling their hair out - there's a fundamental flaw in the implementation of the tabs in MDL that you will hit in any dynamic frontend library.

https://github.com/google/material-design-lite/issues/1165

Due to the way that the elements used for the tabs (and panels) are found and decorated, any tabs added to a tab set after an initial render won't get the JS listeners invoked. I've found that the first tab in the set gets a second listener instead of the second tab getting it.

There's workarounds in the linked issue - I'm trying to find the best one for my use case at the moment.