Backport PR #21192 on branch v3.5.x (Discourage making style changes to extern/.)#21194

Merged

timhoffm merged 1 commit intomatplotlib:v3.5.xfrom

meeseeksmachine:auto-backport-of-pr-21192-on-v3.5.x

Sep 27, 2021

Commits on Sep 27, 2021

Backport PR #21192: Discourage making style changes to extern/.

dstansby
authored and
meeseeksmachine
committed