Hi
Has anyone else noticed that deleting a layer whose visibility has been disabled (closed eye button), shows up in the Undo History as "Unhide layer"? If the layer's visibility is enabled (open eye), then deleting it does result in "Delete layer" in the Undo History. This is in v 0.46, the last stable release. And I'm deleting by clicking the minus (-) sign in the Layers dialog, with the closed eye layer selected.

Is this expected? If not, should it be reported on Launchpad?

I can confirm what you described and it sounds like a bug to me (albeit a minor one). It would be a good idea to report it if it hasn't been already.