Profile Viewer

[pfitzseb]

The flame graph viewer is easily re-useable in other contexts, e.g. Pluto notebooks (rendered notebook).

ToDo:

• inline highlights (this is the big one, but shouldn't be particularly tricky)
• check high DPI rendering
• fix path handling
• hook up "next/previous Profile" commands
• check (and maybe improve) flame graph performance good enough for now, especially compared to Juno
• maybe disable any subpixel rendering by rounding all positions/heights/widths keeping this as-is for now
• get rid of (or integrate) FlameGraphs.jl
• conditionally enable thread selection on Julia 1.8
• pane icon
• stdlib path handling
• improve hashing/coloring logic (for more easily distinguishable colors)
• make inline tooltip respect thread selector
• gracefully handle multiple inline traces on a line (currently gets an opaque background fairly quickly)

Further possible improvements I won't implement in this PR

• tabular view
• task selector widget
• themeing/using VS Code named colors
• prune/skip past internals
• "collapsed mode", which collapses tall stacks (frames with only one child don't show up)

Fixes #2606, fixes #2531, fixes #1545.

[pfitzseb]

[lrnv]

What you did here is sick. This is really looking great. I saw the next-minor milestone, but when do you think we will get this on insider ?

[pfitzseb]

Hopefully sometime this week.