David Taylor 6e9bb84d12
FIX: Ensure theme names are escaped in HTML attributes (#15272)
If a theme name contained a double-quote, this problem could lead to invalid/unexpected HTML in the `<head>`

Note that this is not considered a security issue because themes can only be installed/named by administrators, and themes/administrators already have the ability to run arbitrary javascript.
2021-12-13 10:50:09 +00:00
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