Improve LaTeX worksheet export
Summary:
Remove unused filter, add extention for exported file, if it not setted, set correct xml attribute for latexresult and add decoding HTML '&', '>', '<' characters to valid for LaTeX characters
BUG: 387304
FIXED-IN: 18.04.2
Test Plan:
- Write Maxima worksheet with matrixs and comparison operations.
- Export the worksheet to LaTeX
- See tex output and check, that the result is incorrect for LaTeX
- Apply the patch
- Export again and check, that now the result is correct and may be builded with LaTeX
Reviewers: Cantor, asemke
Reviewed By: Cantor, asemke
Subscribers: kde-edu, asemke, Cantor
Differential Revision: https://phabricator.kde.org/D12767