List of bundled plugins and what they are required for

We use Qt for a desktop application and over the years our deployment has updated to included various plugins as they get split off or added to the Qt framework. We just updated to Qt6 from Qt5 and we're going through another round of "Why doesn't this work? Oh, there's a plugin missing!"

I'm not complaining about the plugins – once figured out, there's zero problem going forward – but I'd really find it helpful if there was a listing in the documentation of the available plugins and what functionality they enable.

I'm aware we could just ship all the plugins, but we'd prefer to ship what we need, not the kitchen sink. I was surprised there wasn't already even a listing of available 'built-in' plugins. Frankly ,there should be a list of plugins, and each one should indicate what won't work if they aren't present. For example, windowsvistastyle could indicate that it provides the newer style for Windows platforms and failing to include it means the default Windows UI will look like the Windows 95 era. Another good example would be explaining that if you're using the QNetwork classes, you need the tls plugins, but if you're using QWebEngine, you don't.

I tried to figure this out myself looking at the source code, but it is not easy to figure out and it's kind of the cart before the horse; if I'm using the X component of Qt and it doesn't work, I'm going to look up the documentation of X – it should say – somewhere! – in there that it requires the Y plugin to work.