OK Tristan - strange but true. Tried your database collection and you are right. But it seems even stranger than at first glance…
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Double-click on a rich-text field that has content: editor pops up.
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Double-click on a rich-text field that is empty: nothing happens
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Enter in some text so that the rich-text field is no longer empty, and then double-click on the field: nothing happens.
It seems to me as if having rich-text content in the field “primes the pump” - that is, sets the field to rich-text. And, if an empty field is then “filled” with some plain text (not rich-text), the editor still does not pop up.
I will pass this by QA and I suspect a ticket will be opened for this.
So, take a cigar out of petty cash.