STACK 4.3 to 4.4

New features

• Dynamic linking of external content in question variables (useful for feedback variables) and in question text (useful for inserting meclib areas)
• castext() function for proper TeX formatting in dynamic strings (e.g. feedback)
• Conditional text blocks
• Upgrade to JSXGraph 1.4.4 (was 1.2.1 in STACK 4.3)

Migration problems

• ev(expr, a=b, c=d,...) might fail. Workaround: use at(expr, [a=b, c=d,...]). Note that the equations need to be in a separate list. See github issue 830
• Text with embedded CAS expressions like {@@} might requires either equations bracketed by \\\( \\\) or being explicitly set to HTML using paragraph tags. Sometimes even the whole widget must be set to HTML
• Related to Maxima and unicode (if your Maxima isn't unicode-proof), for discussion and handling see STACK issue #832
  • Umlauts (äöüß) sometimes must be replaced by HTML codes: ä ö ü ß
  • Special characters like ° sometimes must be written as HTML code °
• Related to Mathjax
  • Decorations in meclib labels must be bracketed. Instead of \\bar v write \\bar{v}.
  • Label placement in meclib images can be poor. Eventually "label" objects must be used.