the regex that marked backslashes in wysiwyg strings as punctuation
was trying to only match wysiwyg strings that actually contained a
backslash
this could lead to an off-by-one error matching the end of one
wysiwyg string and the beginning of a suceeding wysiwyg string
(see https://regex101.com/r/yqdATM/1/)
fixed by simply matching all wysiwyg strings and optionally marking
contained backslashes as punctuation
Coverage remained the same at 90.598% when pulling 908d55b24e7138195fbe3e2af1171efea2c6d4cd on MartinNowak:fix49 into e64d5fc963ac7e4662bb0397684d8b2c55b25e39 on Emacs-D-Mode-Maintainers:master.
fixes #49