Signed-off-by: alingse <alingse@foxmail.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.6 to 4.1.7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@a5ac7e5...692973e)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4.3.1 to 4.5.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@5ecb98a...e28ff12)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alexey Alexandrov <aalexand@users.noreply.github.com>

Previously, the click handler would fire after some text was selected
with the mouse. This would switch pivots and forget the selected text.

We now switch the pivot only if the mouse did not move significantly
between mouse-down and mouse-up.

Fixes #870.

Previously the profile details box (displayed when clicking button
at top-right of web view), would partially overlap flame graph text.
Tweak z-index values to fix this problem.

Also, colocate all z-index CSS entries to make the stacking order
of different things easier to compare.

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 5.0.1 to 5.0.2.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@cdcb360...0a12ed9)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Previously, we used to call report.TextItems() during flame
graph generation just so we could get a hand on the legend
to print in the profile details box. All the work done by
TextItems() to produce a trimmed graph was discarded.

This change separates out the legend generation into a
separate routine so that we can avoid doing the unnecessary
work.

Benchmark result:

```
name      old time/op  new time/op  delta
Flame-12   6.10s ± 3%   0.39s ± 4%  -93.59%  (p=0.000 n=10+10)
```

In some edge cases (e.g. injected JIT symbols), function names can have
new lines. This breaks the llvm-symbolizer output parsing, and makes
pprof hang.

Conveniently, as of LLVM 13, llvm-symbolizer has a JSON output mode,
which is robust against all kinds of weirdness like new lines. We can
use this instead of the line-based parsing, and as a bonus we get much
simpler handling of multiple frames in a stack, as the JSON output
already returns these as an array.

This also requires splitting the CODE and DATA processing into separate
functions, since their JSON output is incompatible. For now, we keep the
DATA output as before, a slightly hacky but functional concatenation of
start + size, but this could be improved.

Co-authored-by: Alexey Alexandrov <aalexand@users.noreply.github.com>