Timeline visualization regression

[ledor473]

Requirement - what kind of business use case are you trying to solve?

Visualize traces

Problem - what in Jaeger blocks you from solving the requirement?

I'm not totally sure how but seems like the pull request #297 broke the indentation in the timeline view in some cases.

If I checkout the previous commit in master (ac4f7a7) I see this:

But when I checkout this commit from master (f23eb48) I see this:

Here's the trace that is in the screenshot above: https://gist.github.com/ledor473/a51e66aee1f14285eef4953ae7ee6d59

Proposal - what do you suggest to solve the problem or improve the existing situation?

I'm not sure what broke it exactly, so its hard to propose a fix.

[yurishkuro]

@tiffon @everett980 please take a look

[everett980]

Thanks for raising!
I have a change to ancestor-ids in this pr
I will verify that it fixes the issue for this trace (it should).