fix: fix buffer_changed event, fix diagnostics final severity #1237
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fixes #1225, fixes issues form discussion #1234
Somehow the buffer_changed event was not connected to an autocmd, it was probably lost along the way.
I also discovered that the diagnostics was no longer setting the most severe as the final level. This was also something that was broken recently.
Finally, I think I fixed the glitchy test issue from #1225. It had an extra test that was not related to what should have been tested. I'm not sure why it sometimes worked...