fix(ego-lint): widen R-VER48-02 guard-window for distant version checks (#53)

## Summary

- Increase R-VER48-02 `guard-window` from 3 to 10 to recognize
PACKAGE_VERSION guards that appear far from the deprecated API call
(e.g., cached in a variable then used in nested ternaries)
- Add test fixture `version-guard-distant@test` reproducing the Dash to
Panel false-positive pattern where the guard is 5-9 lines from the
deprecated `Meta.disable_unredirect_for_display()` call

## Context

In Dash to Panel's `src/utils.js`, the version-compat guard
`Config.PACKAGE_VERSION >= '48'` is cached in a `v48` variable, then
used in nested `if/else` ternaries. The deprecated
`Meta.enable_unredirect_for_display()` and
`Meta.disable_unredirect_for_display()` calls appear 5 and 9 lines after
the guard respectively. With `guard-window: 3`, the sliding `deque`
lookback had already evicted the guard line, causing false positives.

Closes #39
Closes #42

## Test plan

- [x] New fixture `version-guard-distant@test` passes (R-VER48-02
suppressed)
- [x] Existing fixture `version-guard-pkgver@test` still passes
(close-range guard)
- [x] Full test suite passes with zero regressions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: ZviBaratz

rules/patterns.yaml

@@ -923,7 +923,7 @@
   fix: "Access via global.compositor instead of Meta directly"
   min-version: 48
   guard-pattern: "if\\s*\\(\\s*Meta\\.disable_unredirect|PACKAGE_VERSION.*['\"]4[89]|PACKAGE_VERSION.*['\"][5-9]"
-  guard-window: 3
+  guard-window: 10
 
 - id: R-VER48-03
   pattern: "\\bCursorTracker\\.get_for_display\\b"

tests/assertions/dash-to-panel-fixes.sh

@@ -16,6 +16,13 @@ assert_exit_code "exits with 0 (version guard suppresses R-VER48-02)" 0
 assert_output_not_contains "no FAIL for R-VER48-02 with PACKAGE_VERSION guard" "\[FAIL\].*R-VER48-02"
 echo ""
 
+# --- version-guard-distant (R-VER48-02 guard-window with distant guard) ---
+echo "=== version-guard-distant ==="
+run_lint "version-guard-distant@test"
+assert_exit_code "exits with 0 (distant version guard suppresses R-VER48-02)" 0
+assert_output_not_contains "no FAIL for R-VER48-02 with distant PACKAGE_VERSION guard" "\[FAIL\].*R-VER48-02"
+echo ""
+
 # --- deprecated-in-comments (skip-comments for R-DEPR-05/06) ---
 echo "=== deprecated-in-comments ==="
 run_lint "deprecated-in-comments@test"

tests/fixtures/version-guard-distant@test/LICENSE

@@ -0,0 +1 @@
+SPDX-License-Identifier: GPL-2.0-or-later

tests/fixtures/version-guard-distant@test/extension.js

@@ -0,0 +1,30 @@
+import {Extension} from 'resource:///org/gnome/shell/extensions/extension.js';
+import Meta from 'gi://Meta';
+import * as Config from 'resource:///org/gnome/shell/misc/config.js';
+
+let unredirectEnabled = true;
+
+export default class DistantGuardExtension extends Extension {
+    enable() {
+        this._setDisplayUnredirect(true);
+    }
+
+    _setDisplayUnredirect(enable) {
+        let v48 = Config.PACKAGE_VERSION >= '48';
+
+        if (enable && !unredirectEnabled)
+            v48
+                ? global.compositor.enable_unredirect()
+                : Meta.enable_unredirect_for_display(global.display);
+        else if (!enable && unredirectEnabled)
+            v48
+                ? global.compositor.disable_unredirect()
+                : Meta.disable_unredirect_for_display(global.display);
+
+        unredirectEnabled = enable;
+    }
+
+    disable() {
+        this._setDisplayUnredirect(false);
+    }
+}

tests/fixtures/version-guard-distant@test/metadata.json

@@ -0,0 +1,7 @@
+{
+    "uuid": "version-guard-distant@test",
+    "name": "Distant Version Guard Test",
+    "description": "Tests R-VER48-02 guard-window with guard far from deprecated call",
+    "shell-version": ["48"],
+    "url": "https://example.com"
+}