Using 3.4.7544 P I noticed that when selecting tracks > Auto-Tag by track > Update missing lyrics the tick box in the header (to the left of 'name') that allowed one to select all or deselect all is no longer present. I don't know when this disappeared, but it would be handy to have it back.
Often I have an album with lyrics but upon inspection I notice a couple of tracks are incorrect. I would select them all and when the dialog appears, they're all unticked and the status says 'already has lyrics." In the past I could tick the box in the header and all would be ticked and I could re-run the lyrics auto-tag. Now I have to tick each track.
I don't know if the tick box going missing was intentional, or a mistake, but I would like it back. It certainly was present in 3.3. I've been using 3.4 for quite some time, but just noticed this today.
For comparison sake, what I'm talking about still exists in the Analyse Volume dialog.