add user setting

Now this is disabled by default

modules/shared_options.py

@@ -101,6 +101,7 @@ options_templates.update(options_section(('upscaling', "Upscaling", "postprocess
     "DAT_tile": OptionInfo(192, "Tile size for DAT upscalers.", gr.Slider, {"minimum": 0, "maximum": 512, "step": 16}).info("0 = no tiling"),
     "DAT_tile_overlap": OptionInfo(8, "Tile overlap for DAT upscalers.", gr.Slider, {"minimum": 0, "maximum": 48, "step": 1}).info("Low values = visible seam"),
     "upscaler_for_img2img": OptionInfo(None, "Upscaler for img2img", gr.Dropdown, lambda: {"choices": [x.name for x in shared.sd_upscalers]}),
+    "scaleBy_from_upscaler": OptionInfo(False, "Automatically set the Scale by factor based on the name of the selected Upscaler.").info("Will not change the value when no matching pattern is found."),
 }))
 
 options_templates.update(options_section(('face-restoration', "Face restoration", "postprocessing"), {

modules/ui_postprocessing.py

@@ -53,7 +53,8 @@ def create_ui():
                     show_extras_results = gr.Checkbox(label='Show result images', value=True, elem_id="extras_show_extras_results")
 
             script_inputs = scripts.scripts_postproc.setup_ui()
-            hook_scale_update(script_inputs)
+            if getattr(shared.opts, 'scaleBy_from_upscaler', False):
+                hook_scale_update(script_inputs)
 
         with gr.Column():
             toprow = ui_toprow.Toprow(is_compact=True, is_img2img=False, id_part="extras")