feat(actions): After restoring entry, write undo command to log

This way the undo command can always be found in `:DiffviewLog`. This is
now also mentioned in the docs.

Also run `:checktime` for the restored buffer.

Author: sindrets

doc/diffview.txt

@@ -1141,7 +1141,7 @@ restore_entry                                   *diffview-actions-restore_entry*
             entry's commit.
 
         NOTE: A command is echoed that shows how to undo the change. Check
-        |:messages| to see it again.
+        |:messages| or |:DiffviewLog| to see it again.
 
 scroll_view({distance})                         *diffview-actions-scroll_view*
         Contexts: `panel`
@@ -1375,7 +1375,8 @@ X                       Revert the selected file entry to the state from the
                         left side of the diff. This only works if the right
                         side of the diff is showing the local state of the
                         file. A command is echoed that shows how to undo the
-                        change. Check |:messages| to see it again.
+                        change. Check |:messages| or |:DiffviewLog| to see it
+                        again.
 
                                                 *diffview-maps-refresh_files*
 R                       Update the stats and entries in the file list.

lua/diffview/vcs/adapters/git/init.lua

@@ -1543,6 +1543,10 @@ GitAdapter.file_restore = async.wrap(function(self, path, kind, commit, callback
       utils.vec_join("checkout", commit or (kind == "staged" and "HEAD" or nil), "--", path),
       self.ctx.toplevel
     )
+
+    await(async.scheduler())
+    local bn = utils.find_file_buffer(abs_path)
+    if bn then vim.cmd(fmt("checktime %d", bn)) end
   end
 
   callback(true, undo)

lua/diffview/vcs/utils.lua

@@ -9,6 +9,7 @@ local utils = require("diffview.utils")
 local api = vim.api
 local await = async.await
 local fmt = string.format
+local logger = DiffviewGlobal.logger
 
 local M = {}
 
@@ -160,7 +161,10 @@ M.restore_file = async.void(function(adapter, path, kind, commit)
   end
 
   local rev_name = (commit and commit:sub(1, 11)) or (kind == "staged" and "HEAD" or "index")
-  utils.info(fmt("File restored from %s. %s", rev_name, undo and "Undo with " .. undo), true)
+  local msg = fmt("File restored from %s. %s", rev_name, undo and ("Undo with " .. undo) or "")
+
+  logger:info(msg)
+  utils.info(msg, true)
 end)
 
 --[[