[reddit] add 'limit' option (#7997 #8012 #8092)

change default value from 100 to null,
i.e. don't send a 'limit' parameter

docs/configuration.rst

@@ -4605,6 +4605,22 @@ Description
     Ignore all submissions posted before/after the submission with this ID.
 
 
+extractor.reddit.limit
+----------------------
+Type
+    ``integer``
+Default
+    ``null``
+Description
+    Number of results to return in a single API query.
+
+    This value specifies the ``limit`` parameter
+    used for API requests when retrieving paginated results.
+
+    ``null`` means not including this parameter at all
+    and letting Reddit chose a default.
+
+
 extractor.reddit.previews
 -------------------------
 Type

docs/gallery-dl.conf

@@ -632,6 +632,7 @@
             "date-format" : "%Y-%m-%dT%H:%M:%S",
             "id-min"      : null,
             "id-max"      : null,
+            "limit"       : null,
             "previews"    : true,
             "recursion"   : 0,
             "selftext"    : null,