Highlight lost probes in sample history

[fujiapple852]

When a probe times out (does not respond before a round ends) or fails to send (due to a local network error) the samples chart shown it as the absence of a value (a blank vertical bar). For example:

It is desirable to show Awaited (i.e. timed out) and Failed probes as solid vertical lines of different colours to make the distinction clearer.

[c-git]

Yeah I think that would be more intuitive when reading the chart and would make nodes that never responded have a full bar instead of an empty bar which might be better. I think a full bar is better but I guess that's subjective.

[fujiapple852]

I actually did this in an early version of Trippy (red vertical bar for 0), but I had to vendor and modify tui-rs (as it was then) in place. I'll have to upstream the change to the widget.

[c-git]

Is it possible to create a derived widget with the alternate behaviour? Or perhaps a toggle to choose the behaviour as I can imagine other cases where an empty space is the preferred behaviour.

[fujiapple852]

WIP:

[fujiapple852]

Feature request: ratatui/ratatui#1325
PR to implement it: ratatui/ratatui#1326