Tooltip units incorrect when using stacked, percentage graphs

[jamesmulcahy]

I've setup a graph which has multiple series which represent timings, in milliseconds. I'm drawing these stacked, as percentages and because of this, I've set the left axis units to 'percent' such that the axes looks correct (i.e. has 0-100%, rather than 0-100ms, if I'd used 'ms' as my units).

Having done that though, if I enable the "All Series" tooltip view, the values displayed in the tooltip also have a % suffix, despite being in milliseconds themselves. In the normal/non-"All Series" view, they display as %ages correctly.

[jamesmulcahy]

[torkelo]

dupe of #1175