Bug 461235

SUMMARY

I'm currently having troubles with the QuickPreview tool. (not the LivePreview one)
When setting it to XeLaTex (in order to manage packages like polyglossia), it behaves as follows :
- When using it on an environment : kile uses pdftek instead of xelatex. Of course, it doesn't work.
- When using it on a sub-document : kile uses xelatex, as expected, and... it works (as expected)
This doesn't depend on the content of the document.
I observed the same behavior with LuaLaTex settings.
Setting "Quickpreview" to "XeLaTex" or to "XeLaTex + PDF (okular)" doesn't change anything.
I had really no idea to fix the problem, as QuickPreview settings are (I guess) not in kilerc file. So : how could I fix it ? Any idea ? Is it an internal bug in the definition of quickpreview ?
Thanks for your help !
J

STEPS TO REPRODUCE
1.  In config panel, Preview > Set first parameter to "XeLaTex" or "XeLaTex --> PDF"
2.  Run a quickpreview of an env with the package polyglossia : it runs the following command :  pdflatex -synctex=1 -interaction=nonstopmode -output-directory=/tmp/kile-livepreview.ozSfBF modele.tex
3.  Run a quickpreview of a subdoc : it uses xelatex : xelatex -interaction=nonstopmode preview.tex

OBSERVED RESULT
As expected :
2. does not work, because it used pdftex
3. does work, because it used xelatex

EXPECTED RESULT
We expect 2. to use xelatex, and not pdftex

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.13.19-2-MANJARO (64 bit)
KDE Plasma Version:  5.25.5
KDE Frameworks Version: 5.98.0
Qt Version:  5.15.6

ADDITIONAL INFORMATION