Fix rendering of opaque layers with opacity != 1 #4939
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Fix rendering of opaque layers with opacity != 1
ahocevar
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Fix rendering of opaque layers with opacity != 1
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When a layer has an opacity set, clip rectangles have to be calculated even when the source has the opaque flag set. Otherwise lower resolution tiles will change the visual opacity of rendered tiles.
To avoid 1-pixel lines at clip extent boundaries, the clip rectangle coordinates are now calculated the same way as the tile insert points.
Fixes #4934.