devtools: inferred action name is corrupted when caller's source path contains spaces

[happyTaher]

Summary

When setState is called without an explicit action name, the devtools middleware infers the action name from the call stack. The regex used to parse a V8 stack frame is:

const v8StackLineRe = /.+ (.+) .+/

This captures the token between two spaces. If the caller frame's source path contains a space, the greedy match lands inside the path and the wrong text is used as the action name in Redux DevTools.

Affected cases

Common real-world paths with spaces:

• webpack namespaces, e.g. at Object.increment (webpack://my app/./src/store.js:10:5) → action name becomes "(webpack://my"
• Windows paths, e.g. at increment (C:\Program Files\app\store.js:10:5) → action name becomes "(C:\Program"

Expected action name in both cases: increment (or Object.increment).

Reproduction (regex in isolation)

const re = /.+ (.+) .+/
re.exec('at Object.increment (webpack://my app/./src/store.js:10:5)')[1]
// => "(webpack://my"   (expected: "Object.increment")

Impact

Cosmetic — devtools-only. Actions still dispatch correctly; only the displayed action label is wrong. Paths without spaces and anonymous frames are unaffected.

Fix

Anchor the match to at and stop at the first (: /^at (.+?) \(/. This is equivalent on all space-free paths (and on the cases covered by the existing tests) and fixes the spaced-path cases. PR incoming with a deterministic test.

[dai-shi]

Thanks for reporting.

[dai-shi]

Please check #3531