[LO Calc] Sorting protected cells with autofilter?

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While trying to sort the results in ascending/descending order, I receive the warning "Protected cells cannot be modified" ... However, that operation does not change the contents of the cells...

Where did you take that conclusion from? If cell A1 has a value B and cell A2 has a value A and you alpha-sort, then A1 has value A and cell A2 has value B after the sort. From my perspective this is a change.

is it possible to reorder protected rows ?

Sort doesn't reorder rows but reorders content to new rows according your sort criteria.

And in that sense you put the title of your question wrong. You are asking about Sorting protected cells and not about Autofilter protected cells (which isn't a problem at all)

Ah, you're right! I was considering a column as index for my rows... Now it makes sense. Thank you!

About the title of the question, it is not just a matter of sorting, but sorting while using autofilter.

it is not just a matter of sorting, but sorting while using autofilte

No - it is only a matter of sorting. Autofilter on protected cells works as usual and it does not matter if you use sort while being in autofilter or if you just sort (the sort causes the protected cells not being reordered since this action would change cell content, while filtering only hides rows [i.e. sets row width to zero], but doesn't change content)

Sorry, maybe I haven't expressed myself well: the autofilter tool, when applied to a cell, adds a dropdown menu, where you can actually filter, but also sort rows. I didn't realize those sorting options do the same operations as the sorting tools (in the toolbars). I thought the autofilter menu ones were different tools, somewhat visual only...