Have upscale button use the same seed as hires fix.

modules/scripts.py

@@ -91,6 +91,9 @@ class Script:
     setup_for_ui_only = False
     """If true, the script setup will only be run in Gradio UI, not in API"""
 
+    controls = None
+    """A list of controls retured by the ui()."""
+
     def title(self):
         """this function should return the title of the script. This is what will be displayed in the dropdown menu."""
 
@@ -624,6 +627,7 @@ class ScriptRunner:
         import modules.api.models as api_models
 
         controls = wrap_call(script.ui, script.filename, "ui", script.is_img2img)
+        script.controls = controls
 
         if controls is None:
             return
@@ -918,6 +922,23 @@ class ScriptRunner:
             except Exception:
                 errors.report(f"Error running setup: {script.filename}", exc_info=True)
 
+    def set_named_arg(self, args, script_type, arg_elem_id, value):
+        script = next((x for x in self.scripts if type(x).__name__ == script_type), None)
+        if script is None:
+            return
+
+        for i, control in enumerate(script.controls):
+            if arg_elem_id in control.elem_id:
+                index = script.args_from + i
+
+                if isinstance(args, list):
+                    args[index] = value
+                    return args
+                elif isinstance(args, tuple):
+                    return args[:index] + (value,) + args[index+1:]
+                else:
+                    return None
+
 
 scripts_txt2img: ScriptRunner = None
 scripts_img2img: ScriptRunner = None