- Update to version 4.2.3
* fix unable to save under special circumstances (#2124)
* fix stuck to save unsaved document (only in explicit root mode and with a new unsaved document,#2153)
* xindex engine added
* fix math highlighting in keyvals (#2138)
* add context menu in embbeded pdf viewer to invert pdf colors
* remember window state (maximized/normal) of config dialog
* fix (and speed-up) miktex package detection
* fix handling apostrophed words better in spellchecker (#2179)
* regular expression in extended search behave the same as in normal search
* more cwls