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A new control for setting a label's "z-index" has been added to the labeling properties dialog. This control (which also accepts data-defined overrides for individual features) determines the order in which label are rendered. Label layers with a higher z-index are rendered on top of labels from a layer with lower z-index. Additionally, the logic has been tweaks so that if 2 labels have matching z-indexes, then: - if they are from the same layer, a smaller label will be drawn above a larger label - if they are from different layers, the labels will be drawn in the same order as the layers themselves (ie respecting the order set in the legend) Diagrams can also have their z-index set (but not data defined) so that the order of labels and diagrams can be controlled. Note that this does *NOT* allow labels to be drawn below the features from other layers, it just controls the order in which labels are drawn on top of all the layer's features. Fix #13888, #13559