legend needs logic to deal with new linestyle scaling by linewidth

[efiring]

#5926 improves the linestyle dot and dash patterns, but with a wide line, legend does not show a long enough segment to show the pattern.

[WeatherGod]

A possible suggestion to solve this problem is to scale the width of the
swath by the linewidth, kind of like maintaining an aspect ratio.

On Mon, Feb 8, 2016 at 4:29 PM, Eric Firing notifications@github.com
wrote:

#5926 #5926 improves the
linestyle dot and dash patterns, but with a wide line, legend does not show
a long enough segment to show the pattern

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#5977.

[efiring]

This can be handled manually by the user by specifying the rcParams['legend.handlelength'] appropriately, so this is not urgent. Something like @WeatherGod's suggestion can be implemented later if we find that this would be a substantial improvement in convenience. If so, this can be reopened.