Inserting complex LaTeX caching too casual

[sphh]

Latex It!'s caching mechanism only looks for changes in the equation itself and the (font) size. This works well for "inline" equations, because this is the only part allowed. When inserting complex LaTeX, it is possible to include another package (e.g. to change the font). Without changing the mathematical expression, Latex It! currently does not detect the change and uses the cached picture.