Resize legend in chart widget so that line patterns are visible

[AmyRoust]

In an effort to make a line chart more accessible to people experiencing disabilities, we changed the line pattern for each line. Unfortunately, the legend isn't wide enough to show which lines are using which patterns:

It would be nice to have the option to expand the patch width/height so that the different line patterns were easier to distinguish.

Alternative: if the Legend widget could be connected to a chart, that might give us the flexibility we need.