Retain filters on expanded graphs

Currently in LM, if you expand a graph (either from the Device view or the Dashboard), you can then filter out the displayed instances by clicking them in the legend. However, if the time period for the graph is changed (say, from 1 hour, to 5 hours), those filters are reset, and the instances must be re-clicked. This is very tedious when trying to compare data over windows time in a custom graph with a lot of instances.

It's possible to create a new graph with the subset of instances desired for observation, but that's fairly tedious as well, and leads to large amount of clutter for what often ends up being a one-time investigation effort. Having the filters preserved by default would be a big time and frustration saver!