i tried thw wipe saved conversion settings trick - no joy.
the root causeof the "bug" and I still consider it a bug - in documentation / code or both is this:
the mechanism used for set indents+remove blank lines ( a paired option - set indents is not available by itself) is:
add explicit margin top, margin bottom =0 definitions to every relevant css entry.
once that has happened the cascading css rules prevent p - whatever in extra css from overriding.
I was following a logical - fix one thing at time clean -up program
my step 1 was to standardise all my indents - so I ran all epubs through the set indent to 1em option ( wchih necessitated also having remove blank lines active)
by step 2 was to be set my preferred line spacings via CSS and that is where it all went pear shaped.
I did take a full backup beforehand so I could revert, but I decided instead to slog on & fix the line spacings book by book, and do a remove indent for 1st paragraph onlytidy-up at the same time - then flag which books I had optimised.
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