Span detail in trace view should be in message box

[wu-sheng]

In Beta, we change the span in the bottom of the trace view, some one give us the feedback:

If the trace contains a lot of spans, let's say more than 50, the span detail is out of explorer visible area. User has to scroll the screen. It is not convenience.

[liuhaoyang]

Is it possible to support spans to collapse and expand based on dependencies?
Just like zipkin:

[wu-sheng]

I and @hanahmily have some aggressive ideas, but we are afraid may effect the stable. So may choose an easy but better way to fix this.

Then we can release our 5.0.0-GA. I think the community really need this version.

[hanahmily]

@wu-sheng I agree with your idea. We should support this feature in next major version which is not 5.0.0.

[wu-sheng]

Not in 5.x