Themes: Allow use of sidebar submenus when theme details open. #14186

Job	Run time
Core running from build / Core running from build / Linux	2m 15s
Core running from src / Core running from src / Linux	1m 59s
Core running from build / Core running from build / Windows	4m 6s
Core running from src / Core running from src / Windows	3m 16s
Core running from build / Core running from build / MacOS	1m 47s
Core running from src / Core running from src / MacOS	1m 55s
Gutenberg running from build / Gutenberg running from build / Linux	8m 44s
Gutenberg running from src / Gutenberg running from src / Linux	8m 45s
Gutenberg running from src / Gutenberg running from src / Windows	11m 35s
Gutenberg running from build / Gutenberg running from build / Windows	12m 2s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 41s
Gutenberg running from src / Gutenberg running from src / MacOS	11m 14s
Slack Notifications / Prepare notifications	2s
Slack Notifications / Success notifications	4s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Failure notifications	0s
Failed workflow tasks	0s
	1h 17m 25s

Provide feedback