[2.19-dev] Fix/restore stringutils escape handling #4620
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Restore string literal escape processing (, ', ") in StringUtils.unquoteText() that was accidentally from the 2.19-dev branch during Spotless formatting backport (commit c6b37d0).
This escape handling exists in main branch (added in Feb 2023, commit d608412) but was lost when Spotless changes were backported to 2.x in Aug 2023.
Changes:
Without this fix, string literals with escape sequences like 'example\.com' for regex patterns are not processed correctly.