Mills idled by wildfires in Western Canada and expectations that more market- or resource-related shutdowns were coming in the region generated stronger sales and stemmed a steep downward slide in prices of Western S-P-F.  Even so, prices in all US framing lumber species faltered in the holiday-shortened week, leaving traders frustrated with a messy and oversupplied market. Prices of various random dimension and studs posted double-digit drops, and the Random Lengths Framing Lumber Composite Price slumped $10.      Week May 31 Last Week  ...