The cursor showing and hiding logic that I previously implemented via the cursor_hider scope object was buggy in that it could end up leaving the cursor hidden at the end of a git2cpp command. This would happen, for example, using a prompt_input which ensures that the cursor is enabled when the prompt is shown and then hides it at the end. The solution, in the presence of potentially nested cursor_hider objects, is to keep a static count of the number of active scope objects and ensure the cursor is shown when this goes down to zero.

It does introduce a static variable which isn't ideal but it is only a single unsigned int.

This is very hard to test, so I am not doing so in CI but I have tested it manually in both macos and wasm builds.