[QGIS-Developer] WARNING No QgsCoordinateTransformContext context set for transform

[Andreas Neumann]

Hi, 

I have a QGIS project with a history (started in QGIS 2.x) that we
carried over to QGIS 3. 

Since some time (some weeks) for every redraw I get several times
(probably for every layer) the following warning message in the "Qt" log
message panel: 

2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform
2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform
2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform
2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform
2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform
2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform
2018-01-30T13:51:13 WARNING No QgsCoordinateTransformContext context set
for transform 

I believe this has to do with the recent changes in datum handling. 

But how would I fix the issue to get rid of the flood of warning
messages? After a few redraws there are thousands iterations of the same
warning message. 

Thank you for your help! 

Andreas
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