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The converting process has been started.
The theme function has been converted.
Tested patch for the local tasks and it works as expected.
Updating title; assigning myself, in preparation for menu.inc patch in #1898478: menu.inc - Convert theme_ functions to Twig.
Closing this (instead of moving it to core queue) in favor of aggregated 'menu.inc' core issue #1898478: menu.inc - Convert theme_ functions to Twig. Git attributions to all participants will happen there.
Automatically closed -- issue fixed for 2 weeks with no activity.
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