fix: Restore position in blame win when open/close commit info win (#74)

After opening the commit info and pressing 'i' again to go into it, when
closing the commit info window the blame window resets to the top of the
file. This fix saves the position in the blame window and restores it
upon exit from the commit info window.

Author: fstp

lua/blame/commit_info.lua

@@ -25,11 +25,20 @@ function CommitInfo:close(cleanup)
     then
         vim.api.nvim_win_close(self.commit_info_window, true)
     end
+    if self.saved_win and self.saved_pos then
+        vim.api.nvim_set_current_win(self.saved_win)
+        vim.api.nvim_win_set_cursor(self.saved_win, self.saved_pos)
+    end
     self.commit_info_window = nil
+    self.saved_win = nil
+    self.saved_pos = nil
 end
 
 ---@param commit Porcelain
 function CommitInfo:open(commit)
+    self.saved_win = vim.api.nvim_get_current_win()
+    self.saved_pos = vim.api.nvim_win_get_cursor(0)
+
     if self.commit_info_window then
         vim.api.nvim_set_current_win(self.commit_info_window)
         return
@@ -77,7 +86,7 @@ function CommitInfo:open(commit)
 
     vim.api.nvim_create_autocmd({ "BufHidden", "BufUnload" }, {
         callback = function()
-            self:close(true)
+            self:close(false)
         end,
         buffer = info_buf,
         group = vim.api.nvim_create_augroup("NvimBlame", { clear = false }),