[XODIDOX]

In the library views and in DialogVideoVersions.xml with an item that has extras. I'd expect it to be true when focused on or selecting an extra.

Seems there is a misunderstanding for this label. The IsVideoExtras infoLabel is for the extras item itself, not for the parent movie item which will always be false. When in library, it's only applicable when you turned on the "Show video with multiple versions as folder" option, this container contains all movie versions and extras, you can use ListItem.IsVideoExtras to check if a specific one is extras or version. In the video version dialog, you should check the Container(51).ListItem, instead of ListItem which is the parent movie item.

Using the latest Kodi version (5e70594e) I also see that videoversionplay was changed to videoversionselect. Will that be the final window name?

"videoversionselect" should be the final name.