> Keep all existing XML content, only make granular updates.

ChatGPT notes that it's not doing it right:

> This updated version loads the existing XML content, removes the existing items, and adds the updated recent items. It preserves the rest of the XML structure.

src/textual_paint/recent_files.py

@@ -84,23 +84,37 @@ def load_recent_files():
 
 
 def save_recent_files(recent_files):
-    # Create the root element
-    root = ET.Element("RecentFiles")
-
-    # Add each recent item to the root element
-    for item in recent_files:
-        root.append(item)
-
-    # Serialize the XML document
-    xml_data = ET.tostring(root, encoding="utf-8")
-
     # Lock the recent file for writing
-    with open(RECENT_FILE_PATH, "w") as file:
-        fcntl.lockf(file, fcntl.LOCK_EX)
+    with open(RECENT_FILE_PATH, "r+") as file:
         try:
+            fcntl.lockf(file, fcntl.LOCK_EX)
+            # Try to read the existing content
+            content = file.read()
+            file.seek(0)
+
+            if content:
+                # Parse the XML document
+                root = ET.fromstring(content)
+                existing_items = root.findall("RecentItem")
+
+                # Remove existing items from the root element
+                for item in existing_items:
+                    root.remove(item)
+
+            else:
+                # Create the root element if the file is empty
+                root = ET.Element("RecentFiles")
+
+            # Add each recent item to the root element
+            for item in recent_files:
+                root.append(item)
+
+            # Serialize the XML document
+            xml_data = ET.tostring(root, encoding="utf-8")
+
             # Write the XML document to the file
-            file.write("<?xml version=\"1.0\"?>\n")
             file.write(xml_data.decode())
+            file.truncate()
         finally:
             # Unlock the recent file after writing
             fcntl.lockf(file, fcntl.LOCK_UN)