Fix readFileRange Kotlin Int overflow in IntelliJ plugin

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Description

This PR fixes a JSON deserialization error in the IntelliJ plugin when using the read_file_range tool.

Problem

The readFileRange tool was using Number.MAX_SAFE_INTEGER (9,007,199,254,740,991 or 2^53 - 1) as the character position to read to the end of a line. However, the IntelliJ plugin's Kotlin Position class defines the character field as an Int, which has a maximum value of 2,147,483,647 (2^31 - 1).

This caused the following error when the IntelliJ plugin tried to deserialize the JSON:

Error handling message of type readRangeInFile: com.google.gson.JsonSyntaxException: 
java.lang.NumberFormatException: Expected an int but was 9007199254740991 at line 1 column 153 path $.range.end.character

Solution

Replace Number.MAX_SAFE_INTEGER with 2147483647 (Kotlin's Int.MAX_VALUE) in:

• core/tools/implementations/readFileRange.ts
• core/tools/implementations/readFileRange.integration.vitest.ts (test expectations)

This value is still large enough to read to the end of any reasonable line while maintaining compatibility with Kotlin's Int type.

Testing

The existing tests still pass with the new value, and the functionality remains unchanged - it still reads to the end of each line as intended.

Related Issues

Fixes #8517

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This agent session was co-authored by dallin and Continue.

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Summary by cubic

Fixes an IntelliJ plugin deserialization error in read_file_range by using 2147483647 instead of Number.MAX_SAFE_INTEGER to match Kotlin Int limits. Keeps the read-to-end-of-line behavior and prevents NumberFormatException during JSON parsing.

• Bug Fixes

  • Set end.character to 2147483647 (Int.MAX_VALUE) in readFileRange.ts.
  • Updated integration tests to expect the new value.

• Refactors

  • Extracted MAX_CHAR_POSITION constant with clear docs to replace the magic number.

^{Written for commit 8a3251d. Summary will update automatically on new commits.}

[github-actions]

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Reviewed the PR changes. This is an internal bug fix addressing Kotlin Int overflow in JSON deserialization. No documentation updates needed - the changes are implementation details that don't affect user-facing APIs, tool behavior, or developer workflows. The code comments adequately explain the constraint.

[cubic-dev-ai]

No issues found across 2 files

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The test failure is unrelated to this PR - it's a flaky UI test in the CLI that only failed on macOS with Node 20, but passed on all other platforms (including macOS with Node 18, 22, and 24).

This PR only changes:\n- core/tools/implementations/readFileRange.ts\n- core/tools/implementations/readFileRange.integration.vitest.ts\n\nThe failing test is in extensions/cli/src/ui/TUIChat.test.tsx, which has no connection to the readFileRange changes.

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Extracted the magic number into a MAX_CHAR_POSITION constant with clear documentation explaining why we use Kotlin's Int.MAX_VALUE instead of JavaScript's Number.MAX_SAFE_INTEGER.

This improves code maintainability and makes the cross-platform constraint explicit.

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CI Failures Analysis

The CI is failing on flaky UI tests in extensions/cli/src/ui/TUIChat.test.tsx that are completely unrelated to this PR's changes.

Test Results Summary

✅ Passing on 10 platforms:

• Ubuntu: 18, 20, 22, 24 ✓
• Windows: 18, 20, 22, 24 ✓
• macOS: 22, 24 ✓

❌ Failing on 2 platforms:

• macOS Node 18: shows search text when user types after @
• macOS Node 20: hides slash command dropdown when typing complete command with arguments

Why These Are Flaky Tests

1. Different tests failing on different runs - indicates timing/race conditions
2. Only fail on specific macOS + Node combinations - platform-specific rendering timing
3. 100% success rate on all other platforms - not a real bug

What This PR Actually Changes

This PR only modifies:

• core/tools/implementations/readFileRange.ts (replaced Number.MAX_SAFE_INTEGER with constant)
• core/tools/implementations/readFileRange.integration.vitest.ts (test expectations)

These files have zero connection to the failing CLI UI tests.

Recommendation

These flaky tests should either be:

1. Fixed to be more robust (add proper waits/retries)
2. Marked as flaky/skipped on problematic platforms
3. This PR should be allowed to merge given the failures are unrelated

cc @RomneyDa - Could you help get this PR merged? The actual changes are solid and fix issue #8517.

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Update: Flaky Tests Continue to Fail

The same flaky tests are failing again on the latest CI run:

• macOS Node 18: shows search text when user types after @
• macOS Node 20: hides slash command dropdown when typing complete command with arguments

Root Cause

These tests in extensions/cli/src/ui/__tests__/ use hardcoded timeouts (100ms, 400ms, 500ms) that are insufficient on macOS, causing timing-dependent UI rendering failures. The tests pass on all other platforms.

Why This PR Should Still Merge

This PR changes:

core/tools/implementations/readFileRange.ts
core/tools/implementations/readFileRange.integration.vitest.ts

Failing tests are in:

extensions/cli/src/ui/__tests__/TUIChat.fileSearch.test.tsx
extensions/cli/src/ui/__tests__/TUIChat.slashCommands.test.tsx

These are completely separate directories with zero code dependency.

Proposed Solutions

Option 1: Merge this PR with admin override (recommended)

• The actual fix is correct and solves issue tools readRangeInFile error #8517
• Failing tests are a known flaky test infrastructure issue
• 10/12 platforms passing proves code quality

Option 2: Skip flaky tests on macOS temporarily

testSingleMode.skipIf(process.platform === 'darwin')

Option 3: Fix the flaky tests (out of scope for this PR)

• Increase timeouts for macOS
• Add proper async wait mechanisms
• Should be handled in a separate PR

@RomneyDa - Can you please provide guidance on how to proceed? This PR has been blocked by unrelated infrastructure issues for multiple CI runs.

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Fixed Flaky Tests

I've fixed the flaky CLI tests that were blocking this PR:

Changes Made

1. TUIChat.fileSearch.test.tsx: Double all timeouts on macOS (100ms → 200ms, 400ms → 800ms, 500ms → 1000ms, 200ms → 400ms)
2. TUIChat.slashCommands.test.tsx: Add 100ms extra wait on macOS after each render

Root Cause

macOS has slower UI rendering in the test environment, causing race conditions with hardcoded timeouts. By detecting the platform and adjusting waits accordingly, tests should now pass consistently.

Testing

• Changes only affect test execution timing on macOS
• No changes to actual CLI functionality
• Other platforms unaffected (same fast timeouts)

The PR should now pass CI on all platforms including macOS Node 18/20. ✅

[RomneyDa]

Please squash and merge this