Deduplicate images in load_gallery_images to prevent duplicate thumbnails

ui/layout.py

@@ -10,15 +10,22 @@ def build_ui(event_handler_function):
     ui_components = {}
 
     # Helper function to load thumbnails from the output folder.
-    def load_gallery_images():
-        output_dir = os.path.abspath(OUTPUT_DIR)
-        if not os.path.isdir(output_dir):
-            return []
-        image_paths = []
-        for fname in sorted(os.listdir(output_dir)):
-            if fname.lower().endswith((".png", ".jpg", ".jpeg", ".gif", ".webp")):
-                image_paths.append(os.path.join(output_dir, fname))
-        return image_paths
++    # Helper function to load thumbnails from the output folder.
++    # It returns a **deduplicated** list of absolute image file paths.
++    # Using a set ensures that even if the same filename appears multiple
++    # times (e.g., due to accidental duplicate saves), the Gallery tab will
++    # only display each image once.
++    def load_gallery_images():
++        output_dir = os.path.abspath(OUTPUT_DIR)
++        if not os.path.isdir(output_dir):
++            return []
++        # Use a set to collect unique absolute paths.
++        image_path_set = set()
++        for fname in sorted(os.listdir(output_dir)):
++            if fname.lower().endswith((".png", ".jpg", ".jpeg", ".gif", ".webp")):
++                image_path_set.add(os.path.join(output_dir, fname))
++        # Convert back to a sorted list for deterministic ordering.
++        return sorted(image_path_set)
 
     # All UI components, including tabs, must be created inside the same Gradio Blocks context.
     with gr.Blocks() as demo: