Redmine

To further explain this, when a ' character is included in an issue subject, right now, we would escape the generated command line argument to convert as follows (assuming the subjet is foo 'bar' baz

text 2,16 'foo '"'"'bar'"'"' baz'

This is a single argument (including the spaces). As explained, there are no surounding quotes around the command line argument as the command in not run through a shell by mini_magick but is directly passed to the command via Open3.popen3. Imagemagick performs some quote-parsing on its own to determine the single or double-quoted string as the last argument to a draw text rule.

However, due to the excessive escaping of the ' characters, imagemagick barfs as its parsing rules for the quoted string expects only only a single quoted string (with internal quotes of the same type escaped by \). This escaping rule as described in the above linked document is implemented by the patch. Thus, after the patch the same issue subject will result in the following command line argument:

text 2,16 'foo \'bar\' baz'