```coffeescript
Marbles.Views.MentionsAutoCompleteTextarea = class MentionsAutoCompleteTextareaView extends Marbles.View
  @view_name: 'mentions_autocomplete_textarea'

  constructor: (options = {}) ->
    super

    @initInlineMentionsManager()

  initInlineMentionsManager: =>
    @inline_mentions_manager = new TentStatus.InlineMentionsManager(el: @el)

  focus: =>
    @el.focus()

```

Fix focusing input with content (focus at end)
user
```coffeescript
Marbles.Views.MentionsAutoCompleteTextarea = class MentionsAutoCompleteTextareaView extends Marbles.View
  @view_name: 'mentions_autocomplete_textarea'

  constructor: (options = {}) ->
    super

    @initInlineMentionsManager()

  initInlineMentionsManager: =>
    @inline_mentions_manager = new TentStatus.InlineMentionsManager(el: @el)

  focus: =>
    selection = new Marbles.DOM.InputSelection(@el)
    end = @el.value.length
    selection.setSelectionRange(end, end)

```
assistant