Addon Manager: Strip some HTML tags from Markdown

src/Mod/AddonManager/Widgets/addonmanager_widget_readme_browser.py

@@ -20,6 +20,7 @@
 # *   <https://www.gnu.org/licenses/>.                                      *
 # *                                                                         *
 # ***************************************************************************
+import re
 
 import FreeCAD
 
@@ -65,7 +66,8 @@ class WidgetReadmeBrowser(QtWidgets.QTextBrowser):
         have native markdown support. Lacking that, plaintext is displayed."""
         geometry = self.geometry()
         if hasattr(super(), "setMarkdown"):
-            super().setMarkdown(md)
+
+            super().setMarkdown(self._clean_markdown(md))
         else:
             try:
                 import markdown
@@ -79,6 +81,16 @@ class WidgetReadmeBrowser(QtWidgets.QTextBrowser):
                 )
         self.setGeometry(geometry)
 
+    def _clean_markdown(self, md: str):
+        # Remove some HTML tags (for now just img and br, which are the most common offenders that break rendering)
+        br_re = re.compile(r"<br\s*/?>")
+        img_re = re.compile(r"<img\s.*?src=(?:'|\")([^'\">]+)(?:'|\").*?\/?>")
+
+        cleaned = br_re.sub("\n", md)
+        cleaned = img_re.sub("[html tag removed]", cleaned)
+
+        return cleaned
+
     def set_resource(self, resource_url: str, image: Optional[QtGui.QImage]):
         """Once a resource has been fetched (or the fetch has failed), this method should be used to inform the widget
         that the resource has been loaded. Note that the incoming image is scaled to 97% of the widget width if it is