The "autofocus" was abused or misbehaved:
1. When users visit a page but they are not going to change a field,
then the field shouldn't get "autofocus"
* the "auth" / "user" page: in most cases, users do not want to change
the names
* see also the GitHub's "settings" page behavior.
2. There shouldn't be duplicate "autofocus" inputs in most cases, only
the first one focuses
3. When a panel is shown, the "autofocus" should get focus
* "add ssh key" panel
This PR fixes all these problems and by the way remove duplicate
"isElemHidden" function.
f63822fe64