isActionEnabledByIndex(int folderIndex) Returns true if the action enables a folder with the specified index.
Implementing methods can rely on that the lastSelectedFolder is not null.
Parameters: folderIndex - the index of the folder.
Returns true if the action enables a folder with the specified index.
Implementing methods can rely on that the lastSelectedFolder is not null.
Parameters: folderIndex - the index of the folder. true if it should enable the action; false otherwise.