ENG-9830 fix: avoid config re-entry when a State is defined in rxconfig.py

[FarhanAliRaza]

State-class creation read get_config().state_auto_setters at class-creation time, which re-entered config loading while rxconfig.py was still importing and raised AttributeError. Cache the flag when the Config is built and read it via get_state_auto_setters(), falling back to the env var before any Config exists.

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Type of change

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• Bug fix (non-breaking change which fixes an issue)

• This change requires a documentation update

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closes #6661

[greptile-apps]

Greptile Summary

This PR fixes an AttributeError raised when a rx.State subclass is defined in rxconfig.py before the Config(...) call, by breaking the re-entrant call to get_config() that occurred at class-creation time.

• Adds _state_auto_setters: bool | None module-level cache in config.py, populated inside Config.__init__, and a new get_state_auto_setters() helper that reads the cache (or falls back to the REFLEX_STATE_AUTO_SETTERS env var, then False) without ever touching get_config().
• Replaces the get_config().state_auto_setters call in BaseState._init_var with get_state_auto_setters(), eliminating the re-entrant import.
• Adds four regression tests covering crash prevention, env-var fallback, default behavior, and cache update after reload.

Confidence Score: 5/5

Safe to merge — the change is minimal and targeted, replacing one call site in state.py and adding a cache variable with a well-defined fallback chain in config.py.

The fix is narrowly scoped: one call-site change in state.py and a new cached accessor in config.py. The fallback chain (cache → env var → False) mirrors existing env-var handling. Four regression tests are added.

No files require special attention.

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/config.py	Adds module-level _state_auto_setters cache populated in Config.__init__, and a new get_state_auto_setters() that reads the cache (or falls back to env var / False) without calling get_config().
reflex/state.py	Replaces get_config().state_auto_setters with get_state_auto_setters() in _init_var, eliminating the re-entrant config load that caused AttributeError.
tests/units/test_state.py	Adds four tests covering the crash regression, env-var fallback, default (no auto-setters), and cache-tracking across reloads — though the reload test only covers States defined outside rxconfig.py, not the full reload-stale scenario.
news/6662.bugfix.md	Changelog entry for the bug fix.
packages/reflex-base/news/6662.bugfix.md	Changelog entry for reflex-base package.

_{Reviews (2): Last reviewed commit: "docs: add changelog entries for config r..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 8 skipped benchmarks¹

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_{Comparing FarhanAliRaza:state-in-config (26b2f48) with main (932f20f)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩