Attempt to read s_tmax from arg first if option not found

modules/processing.py

@@ -148,7 +148,7 @@ class StableDiffusionProcessing:
         self.s_min_uncond = s_min_uncond or opts.s_min_uncond
         self.s_churn = s_churn or opts.s_churn
         self.s_tmin = s_tmin or opts.s_tmin
-        self.s_tmax = opts.data.get('s_tmax', 0) or float('inf')  # not representable as a standard ui option
+        self.s_tmax = opts.data.get('s_tmax', s_tmax or 0) or float('inf')  # not representable as a standard ui option
         self.s_noise = s_noise or opts.s_noise
         self.override_settings = {k: v for k, v in (override_settings or {}).items() if k not in shared.restricted_opts}
         self.override_settings_restore_afterwards = override_settings_restore_afterwards