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Use a safer approach to update renderers after symbol levels are changed
Instead of directly changing the renderer in place in the symbol levels widget, we delegate responsibility for handling the changes to symbol levels to the parent QgsRendererWidget subclass. This allows us to implement different logic in the various subclasses which correctly handle how that particular widget subclass should update any internal symbol references and ultimately update the renderer. Fixes instability and crashes after editing symbol levels. Fixes #42671 (cherry picked from commit 0ba03bd)
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