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15a7079a39
See https://github.com/qgis/QGIS-Enhancement-Proposals/issues/299 Implements the API framework for setting advanced labeling engine rules for a project, and implements 4 initial rule types: - QgsLabelingEngineRuleMinimumDistanceLabelToFeature: prevents labels being placed too *close* to features from a different layer - QgsLabelingEngineRuleMaximumDistanceLabelToFeature: prevents labels being placed too *far* from features from a different layer - QgsLabelingEngineRuleMinimumDistanceLabelToLabel: prevents labels being placed too close to labels from a different layer - QgsLabelingEngineRuleAvoidLabelOverlapWithFeature: prevents labels being placed overlapping features from a different layer (note that the first 3 rules require a build based on GEOS >= 3.10, they are not available for older GEOS builds) Also implements a registry for storing available rule classes, and serialization of rules and configuration in QGIS projects
