v3.9.2
Enforce Style/FrozenStringLiteralComment. (#6265)
Backport #7679 for v3.8.x (#7734)
Backport ensure-realpath-for-theme-dirs-is-in-theme-dir from #7419 to 3.8-stable
Site: Lossless image optimization
return correct file in dir if dir has same name as file (#6569)
Front-matter should be at start of file
Add testcases for YAML syntax error and non UTF-8 encoding
Remove trailing whitespace
Empty permalink now shows an error
adding files
Add PageWithoutAFile class from jekyll plugins (#6556)