[QGIS-Developer] Preview job and slow datasources

[Even Rouault]

> Is it possible that these preview-jobs are responsible for the WMTS
> crashes which are reported in master (and I have myself pretty often)?
> 
> https://issues.qgis.org/issues/16966#change-84394
> 
> At least for WMST I would find retrieving 8 times the number of
> images/requests too much? I pretty often have several WMS or WMST layers
> in the a layerlist.

Loosely related, but that could occur without job previewing as well. Given the crash 
stack traces I got, seems to be a thread-safety issue with QgsAuthManager use.
PR https://github.com/qgis/QGIS/pull/5646 submitted


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