Add ability to edit run based on track #104
Description
I would like to be able to edit my run by trimming the start or end in a way that would alter the GPX data. Sometimes I start the workout too early or forget to end it. Currently, my only options to edit a run are to change individual data points directly, like the distance or duration.
Describe the solution you'd like
Some UI to allow me to "trim" the start and end of the run would be very helpful. One way I can see this working is start and end drag handles over a graph, akin to trimming an audio or video track. Using the speed graph with time along the X axis would help visualise where I actually started and ended a run.
An alternative, though maybe harder, would be to allow me to drag dots at along the track on the actual route map. This would allow me to drag the dot along the run path until it leaves or arrives at my house.
All GPX data would then be dropped, or maybe better, ignored, which would automatically recalculate all the stats appropriately.
I use Guru maps for hiking, and it does a version of this: left and right drag handles over a line while visually showing the track in the map shorten as I drag. This means I don't need to drag a dot around or obscure the track, while still showing me on the map what the adjustment is. It also is non-destructive so I can remove or change the trim later.