ikiwiki po plugin does not play well with inline directives

Originally created by @BitingBird on #6907 (Redmine)

See screenshot in attachment.

• Other symptoms: tails/tails#9279, tails/tails#10124, tails/tails#9671. More such tickets are reported regularly.

Attachments

• broken-inline.png
• ikiwiki-inline.zip

Related issues

• Related to tails/tails#9671
• Related to tails/tails#9279
• Related to tails/tails#10124
• Related to tails/sysadmin#14588
• Related to tails/tails#16185
• Has duplicate tails/tails#7113
• Has duplicate tails/tails#9564
• Has duplicate tails/tails#12212
• Has duplicate tails/tails#15032
• Has duplicate tails/tails#12246
• Blocks tails/accounting#15507