Formatted text selection
The widget a formatted text field is edited with, in the four states it comes in: a field allowed one format, a field allowed several, a field on a format with no text editor behind it, and a field whose stored format is not one it allows any more. Every one is the same element, and what differs is what the site has told it. Three of the four are altered by mantra_field, which fills the gaps core leaves when a field allows only one format: core hides the selector, so the editor is never told what the text is saved as, and mantra_field names the format in a read-only cell where the selector would have been; core drops a stored format the field no longer allows, which forces a conversion nobody asked for, and mantra_field keeps it selectable; core weights the 'About text formats' link above the control it explains, and mantra_field puts it back underneath. Nothing is saved, and what the page shows depends on the formats the account reading it may use -- a visitor who may not use Full HTML gets core's disabled widget on the fields that store it, which mantra_field deliberately leaves alone.