1. Try to open a text file bigger than 48 MiB in Creator.
   Creator will show a warning:
   
2. Click "Yes".
   Creator will quickly open the file in a binary editor.
   If a file is bigger than EditorManager::maxTextFileSize(), this message box is pointless because the file will be opened in a binary editor anyway.

The warning should not be shown for files bigger than 48 MiB. Files that are too big for the C++-editor but smaller than 48 MiB could be displayed in the plain text editor.