* (bug 26449) Keep underlines from headings outside of tables and thumbs by
adding overflow:hidden to h1,h2,h3,h4,h5,h6 (also fixes editsection bunching).
* (bug 26708) Remove background-color:white from tables in Monobook and Vector.
+* (bug 26781) {{PAGENAME}} and related parser functions escape their output better.
+* (bug 26716) Provide link to instructions for external editor related preferences
+ and add a comment to the ini control file explaining what is going on.
+* Trying to upload a file with no extension or with a disallowed MIME type now gives
+ the right message instead of complaining about a MIME/extension mismatch
+* (bug 26809) Uploading files with multiple extensions where one of the extensions
+ is blacklisted now gives the proper extension in the error message.
=== API changes in 1.18 ===
* (bug 26339) Throw warning when truncating an overlarge API result