Escaping in MIF strings

Created by: Anonymous

Original issue 285 created by @ysavourel on 2012-10-17T23:15:43.000Z:

When merging back string text, the MIF Filter loses escape slashes.
For example:
<VariableDef `<monthname\\> <daynum\>, <year\\>'> becomes: <VariableDef \`<monthname> <daynum>, <year>'>

Also escaped bytes like \x14 get lost or incorrectly merged back.