Leo Hemsted 17cc262ea3 preserve previous state on form error ...

the html now contains a `data-prev-state` attribute which contains the
previous state, taken from the `operation` value in the form data (from
the submit button). This is used to seed the `currentState` of the
templateFolderForm. If not specified (or 'unknown', because the user
hit enter last time round), then set it to nothingSelectedButtons.

2018-12-04 16:41:47 +00:00

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