Fixes #515 by properly, recursively applying linking and styling to text spans inside <a> tags

Author: erickok

lib/html_parser.dart

@@ -336,37 +336,48 @@ class HtmlParser extends StatelessWidget {
         );
       }
     } else if (tree is InteractableElement) {
+      InlineSpan addTaps(InlineSpan childSpan, TextStyle childStyle) {
+        if (childSpan is TextSpan) {
+          return TextSpan(
+            text: childSpan.text,
+            children: childSpan.children
+                ?.map((e) => addTaps(e, childStyle.merge(childSpan.style)))
+                ?.toList(),
+            style: newContext.style.generateTextStyle().merge(
+                childSpan.style == null
+                    ? childStyle
+                    : childStyle.merge(childSpan.style)),
+            // style: (childSpan.style ?? TextStyle())
+            //     .merge(newContext.style.generateTextStyle()),
+            semanticsLabel: childSpan.semanticsLabel,
+            recognizer: TapGestureRecognizer()
+              ..onTap = () => onLinkTap?.call(tree.href),
+          );
+        } else {
+          return WidgetSpan(
+            child: RawGestureDetector(
+              gestures: {
+                MultipleTapGestureRecognizer:
+                    GestureRecognizerFactoryWithHandlers<
+                        MultipleTapGestureRecognizer>(
+                  () => MultipleTapGestureRecognizer(),
+                  (instance) {
+                    instance..onTap = () => onLinkTap?.call(tree.href);
+                  },
+                ),
+              },
+              child: (childSpan as WidgetSpan).child,
+            ),
+          );
+        }
+      }
+
       return TextSpan(
         children: tree.children
                 .map((tree) => parseTree(newContext, tree))
                 .map((childSpan) {
-              if (childSpan is TextSpan) {
-                return TextSpan(
-                  text: childSpan.text,
-                  children: childSpan.children,
-                  style: (childSpan.style ?? TextStyle())
-                      .merge(newContext.style.generateTextStyle()),
-                  semanticsLabel: childSpan.semanticsLabel,
-                  recognizer: TapGestureRecognizer()
-                    ..onTap = () => onLinkTap?.call(tree.href),
-                );
-              } else {
-                return WidgetSpan(
-                  child: RawGestureDetector(
-                    gestures: {
-                      MultipleTapGestureRecognizer:
-                          GestureRecognizerFactoryWithHandlers<
-                              MultipleTapGestureRecognizer>(
-                        () => MultipleTapGestureRecognizer(),
-                        (instance) {
-                          instance..onTap = () => onLinkTap?.call(tree.href);
-                        },
-                      ),
-                    },
-                    child: (childSpan as WidgetSpan).child,
-                  ),
-                );
-              }
+              return addTaps(childSpan,
+                  newContext.style.generateTextStyle().merge(childSpan.style));
             }).toList() ??
             [],
       );