fix(gitIgnore): prevent crash/error when processing malformed file paths in GitIgnoreParser (#7553)

Co-authored-by: Srinath Padmanabhan <17151014+srithreepo@users.noreply.github.com>

packages/core/src/utils/gitIgnoreParser.test.ts

@@ -181,6 +181,16 @@ src/*.tmp
       expect(() => parser.isIgnored('/node_modules')).not.toThrow();
       expect(parser.isIgnored('/node_modules')).toBe(false);
     });
+
+    it('should handle backslash-prefixed files without crashing', () => {
+      expect(() => parser.isIgnored('\\backslash-file-test.txt')).not.toThrow();
+      expect(parser.isIgnored('\\backslash-file-test.txt')).toBe(false);
+    });
+
+    it('should handle files with absolute-like names', () => {
+      expect(() => parser.isIgnored('/backslash-file-test.txt')).not.toThrow();
+      expect(parser.isIgnored('/backslash-file-test.txt')).toBe(false);
+    });
   });
 
   describe('getIgnoredPatterns', () => {

packages/core/src/utils/gitIgnoreParser.ts

@@ -57,16 +57,37 @@ export class GitIgnoreParser implements GitIgnoreFilter {
   }
 
   isIgnored(filePath: string): boolean {
-    const resolved = path.resolve(this.projectRoot, filePath);
-    const relativePath = path.relative(this.projectRoot, resolved);
-
-    if (relativePath === '' || relativePath.startsWith('..')) {
+    if (!filePath || typeof filePath !== 'string') {
       return false;
     }
 
-    // Even in windows, Ignore expects forward slashes.
-    const normalizedPath = relativePath.replace(/\\/g, '/');
-    return this.ig.ignores(normalizedPath);
+    if (
+      filePath.startsWith('\\') ||
+      filePath === '/' ||
+      filePath.includes('\0')
+    ) {
+      return false;
+    }
+
+    try {
+      const resolved = path.resolve(this.projectRoot, filePath);
+      const relativePath = path.relative(this.projectRoot, resolved);
+
+      if (relativePath === '' || relativePath.startsWith('..')) {
+        return false;
+      }
+
+      // Even in windows, Ignore expects forward slashes.
+      const normalizedPath = relativePath.replace(/\\/g, '/');
+
+      if (normalizedPath.startsWith('/') || normalizedPath === '') {
+        return false;
+      }
+
+      return this.ig.ignores(normalizedPath);
+    } catch (_error) {
+      return false;
+    }
   }
 
   getPatterns(): string[] {