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Swap it instead of assigning it (reduces copying)
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@ -308,7 +308,7 @@ NS_IMETHODIMP nsRenderingContextQt::PopState()
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delete mTranMatrix;
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mTranMatrix = state->mMatrix;
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}
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mClipRegion = state->mClipRegion;
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mClipRegion.swap(state->mClipRegion);
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if (state->mColor != mCurrentColor)
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SetColor(state->mColor);
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