Nyall Dawson 06b3678a57 Don't allow users to set maximum thread count for rendering to 1
(This setting can sometimes unwantedly occur when using the same
profile across sessions of newer to very old QGIS versions)

The option is a misleading, as it's actually setting the global
thread limit for the entire QGIS application. If we allow this
to be set to a limit of 1 thread, then deadlocks
occur from the QImage internals in unpredictable ways.
2023-03-03 16:48:34 +10:00
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