Bug fix

code_editor.py

@@ -31,44 +31,50 @@ def render_code_editor(ace_theme):
 
     # ── File Upload ─────────────────────────────
     uploaded_file = st.file_uploader("📤 Upload file", type=["py", "cpp", "c", "java", "js", "cs", "txt"])
-    
-    if "file_uploaded" not in st.session_state:
-        st.session_state.file_uploaded = False
 
-    if uploaded_file and not st.session_state.file_uploaded:
+    if uploaded_file:
         if uploaded_file.size > 10 * 1024 * 1024:
             st.error("🚫 File too large. Max allowed is 10MB.")
         else:
-            content = uploaded_file.read().decode("utf-8", errors="ignore")
-            ext = Path(uploaded_file.name).suffix.lower()
-            detected_lang = EXT_LANG_MAP.get(ext)
-
-            if detected_lang:
-                st.session_state.language = detected_lang
-                st.toast(f"✅ Auto-switched to {detected_lang}", icon="🔄")
-            elif ext == ".txt":
-                st.toast("📄 Loaded text file", icon="📄")
-            else:
-                st.error("❌ Unsupported file format.")
-                return
-
-            st.session_state.code = content
-            st.session_state.file_uploaded = True
-            st.rerun()
+            file_content = uploaded_file.read().decode("utf-8", errors="ignore")
+            filename = uploaded_file.name
+    
+            # Detect change: file name or content changed
+            prev_name = st.session_state.get("uploaded_file_name")
+            prev_content = st.session_state.get("uploaded_file_content")
+
+            if file_content != prev_content or filename != prev_name:
+                ext = Path(filename).suffix.lower()
+                detected_lang = EXT_LANG_MAP.get(ext)
+
+                st.session_state.uploaded_file_name = filename
+                st.session_state.uploaded_file_content = file_content
+
+                if detected_lang:
+                    st.session_state.language = detected_lang
+                    st.session_state.prev_language = detected_lang
+                    st.session_state.code = file_content
+                    st.toast(f"✅ Auto-switched to {detected_lang}", icon="🔄")
+                    st.rerun()
+                elif ext == ".txt":
+                    st.session_state.code = file_content
+                    st.toast("📄 Loaded text file", icon="📄")
+                else:
+                    st.error("❌ Unsupported file format.")
 
     # ── Reset Language if Needed ─────────────────
-    selected_lang = st.session_state.language
-    default_code = DEFAULT_SNIPPETS[selected_lang]
-    previous_lang = st.session_state.get("prev_language")
-
-    if (
-        st.session_state.get("code") is None
-        or st.session_state.code.strip() == ""
-        or selected_lang != previous_lang
-        or st.session_state.code.strip() == DEFAULT_SNIPPETS.get(previous_lang, "")
-    ):
-        st.session_state.code = default_code
-        st.session_state.prev_language = selected_lang
+        selected_lang = st.session_state.language
+        default_code = DEFAULT_SNIPPETS[selected_lang]
+        previous_lang = st.session_state.get("prev_language")
+
+        if (
+            st.session_state.get("code") is None
+            or st.session_state.code.strip() == ""
+            or selected_lang != previous_lang
+            or st.session_state.code.strip() == DEFAULT_SNIPPETS.get(previous_lang, "")
+        ):
+            st.session_state.code = default_code
+            st.session_state.prev_language = selected_lang
 
     # ── Code Editor ─────────────────────────────
     code = st_ace.st_ace(