refactor: Improve main loop to provide real-time UI updates during mouse interactions

gtm2.py

@@ -523,23 +523,27 @@ def main(stdscr, filename, show_diff, show_add, show_del, mouse):
         curses.mousemask(curses.ALL_MOUSE_EVENTS | curses.REPORT_MOUSE_POSITION)
     
     state.load_commit_content()
+    
+    # Initial draw before the main loop starts
+    draw_ui(stdscr, state)
 
     while not state.should_exit:
-        draw_ui(stdscr, state)
-
         key = stdscr.getch()
         if key == -1:
             continue
         
+        # Process input and update the application state
         if key == curses.KEY_RESIZE:
             h, w = stdscr.getmaxyx()
             state.update_dimensions(h, w)
-            continue
-
-        if state.enable_mouse and key == curses.KEY_MOUSE:
+        elif state.enable_mouse and key == curses.KEY_MOUSE:
             handle_mouse_input(stdscr, state)
         else:
             handle_keyboard_input(key, state)
+        
+        # After every action, redraw the UI to reflect changes immediately.
+        # This is crucial for real-time feedback during mouse drags.
+        draw_ui(stdscr, state)
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="A \"Git Time Machine\" for viewing file history")