For R# 7, I can get this to vary by going to1
ReSharper | Options | Code Editing | C# | Formatting Style | Spaces
and toggling
Other | Within single-line initializer braces
the example for which is
int[] x = new int[] {0, 1, 2};
versus
int[] x = new int[] { 0, 1, 2 };
Although the example is of array initialization, it also appears to control object initialization.
1In R# 5, "Code Editing" was "Languages".
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