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quote autocompletion gets in the way of editing strings in debug watch window
VS 2013 Update 2
Try to edit a string in the watch window. When you type the single quote at the end of the string, VS will insert a second single-quote automatically. Trying to undo that will delete both quotes.
It looks like it's VS doing this, we should see if there's a way to suppress it. Also, I don't think I've seen this in 2010/2012.