[artstation] add 'pro-first' option (#3273)

docs/configuration.rst

@@ -885,6 +885,17 @@ Description
     Try to follow external URLs of embedded players.
 
 
+extractor.artstation.search.pro-first
+-------------------------------------
+Type
+    ``bool``
+Default
+    ``true``
+Description
+    Enable the "Show Studio and Pro member artwork first" checkbox
+    when retrieving search results.
+
+
 extractor.aryion.recursive
 --------------------------
 Type

docs/gallery-dl.conf

@@ -37,7 +37,8 @@
 
         "artstation":
         {
-            "external": false
+            "external": false,
+            "pro-first": true
         },
         "aryion":
         {

gallery_dl/extractor/artstation.py

@@ -356,7 +356,8 @@ class ArtstationSearchExtractor(ArtstationExtractor):
             "page"             : None,
             "per_page"         : 50,
             "sorting"          : self.sorting,
-            "pro_first"        : "1",
+            "pro_first"        : ("1" if self.config("pro-first", True) else
+                                  "0"),
             "filters"          : filters,
             "additional_fields": (),
         }