Nyall Dawson 8869c9cbe4 Allow setting a QgsFeedback object in QgsExpressionContext
This can be checked by expression functions which are costly to
evaluate (e.g. those which fetch features from a layer) and which
would benefit from early exits when the results of the expression
evaluation are no longer needed (e.g. due to canceling a layer
rendering, etc)
2021-06-19 06:21:51 +10:00
..
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