prompts_from_file: allow random seeds to be preserved for the list of prompts

scripts/prompts_from_file.py

@@ -96,6 +96,7 @@ class Script(scripts.Script):
 
     def ui(self, is_img2img):
         checkbox_iterate = gr.Checkbox(label="Iterate seed every line", value=False)
+        checkbox_iterate_batch = gr.Checkbox(label="Preserve random seed across lines (for use with \"Generate Forever\")", value=False)
 
         prompt_txt = gr.Textbox(label="List of prompt inputs", lines=1)
         file = gr.File(label="Upload prompt inputs", type='bytes')
@@ -106,9 +107,9 @@ class Script(scripts.Script):
         # We don't shrink back to 1, because that causes the control to ignore [enter], and it may
         # be unclear to the user that shift-enter is needed.
         prompt_txt.change(lambda tb: gr.update(lines=7) if ("\n" in tb) else gr.update(lines=2), inputs=[prompt_txt], outputs=[prompt_txt])
-        return [checkbox_iterate, file, prompt_txt]
+        return [checkbox_iterate, checkbox_iterate_batch, file, prompt_txt]
 
-    def run(self, p, checkbox_iterate, file, prompt_txt: str):
+    def run(self, p, checkbox_iterate, checkbox_iterate_batch, file, prompt_txt: str):
         lines = [x.strip() for x in prompt_txt.splitlines()]
         lines = [x for x in lines if len(x) > 0]
 
@@ -137,7 +138,7 @@ class Script(scripts.Script):
             jobs.append(args)
 
         print(f"Will process {len(lines)} lines in {job_count} jobs.")
-        if (checkbox_iterate and p.seed == -1):
+        if ((checkbox_iterate or checkbox_iterate_batch) and p.seed == -1):
             p.seed = int(random.randrange(4294967294))
 
         state.job_count = job_count