More Neogit* Events

[gollth]

This provides a working solution for my problem in #938. Let me explain:

With the current four events the user (me^^) can set up a vim autocmd which closes and reopens the Graph View. Not pretty, but does the job for me. However it's a bit cumbersome to being only limited to update the view on commit, push, pull & fetch. With these additional events the log view also does update on other commands:

This is my user config for auto-updating:

local group = vim.api.nvim_create_augroup("MyCustomNeogitEvents", { clear = true })
vim.api.nvim_create_autocmd("User", {
  pattern = {
    "NeogitCherryPick",
    "NeogitBranchCheckout",
    "NeogitBranchCreated",
    "NeogitBranchDelete",
    "NeogitBranchReset",
    "NeogitBranchRename",
    "NeogitRebase",
    "NeogitReset",
    "NeogitTagCreate",
    "NeogitTagDelete",
    "NeogitCommitComplete",
    "NeogitPushComplete",
    "NeogitPullComplete",
    "NeogitFetchComplete",
  },
  group = group,
  callback = function(event)
    print("Event: " .. vim.inspect(event.file))
    local buffername = vim.api.nvim_buf_get_name(event.buf)
    if buffername:match("NeogitLogView$") then
      vim.fn.feedkeys("q", "x") -- Close Log Graph
      require("neogit").open({ "log" })
      vim.fn.feedkeys("b", "x") -- Open log graph (branches) again    end
    end
  end,
})

If you want this example config could become part of some "Recipes" documentation or so...

---

FWIW, maybe other people might benefit from these events, that's why this PR =)

[CKolkey]

Cool! I'm planning to handle the buffer update thing with the watcher module, but these could be handy for people regardless, so I don't see the harm. Thanks!

[CKolkey]

(I really like the gif's, btw. Great way to show whats up)