Update indentation removal for links

Author: sydneyjodon-wk

lib/src/rmui_bundle_update_suggestors/constants.dart

@@ -52,9 +52,10 @@ class Link {
   const Link({required this.pathSubpattern});
 
   /// A pattern for finding a link tag with a matching path.
-  RegExp get pattern => RegExp(r'<link[^>]*href="(?<path_prefix>[^"]*)' +
-      pathSubpattern +
-      r'"[^>]*>(?<trailing_new_line>\n?)');
+  RegExp get pattern => RegExp(
+      r'(?<preceding_whitespace>[^\S\r\n]*)<link[^>]*href="(?<path_prefix>[^"]*)' +
+          pathSubpattern +
+          r'"[^>]*>(?<trailing_new_line>\n?)');
 
   @override
   String toString() =>

test/executables/react_18_upgrade_test.dart

@@ -80,10 +80,10 @@ void main() {
           expectedOutput: d.dir('project', [
             d.file('dev.html', /*language=html*/ '''
 <link href="packages/react/js/react.dev.js">
-        '''),
+'''),
             d.file('dev_with_addons.html', /*language=html*/ '''
 <link href="packages/react/js/react.dev.js">
-        '''),
+'''),
           ]),
           args: ['--yes-to-all']);
 
@@ -100,10 +100,10 @@ void main() {
           expectedOutput: d.dir('project', [
             d.file('prod.html', /*language=html*/ '''
 <link href="packages/react/js/react.min.js">
-        '''),
+'''),
             d.file('prod_with_addons.html', /*language=html*/ '''
 <link href="packages/react/js/react.min.js">
-        ''')
+''')
           ]),
           args: ['--yes-to-all']);
     });