🔧 Add :up_to_max_size config for UIDPlusData

When `parser_use_deprecated_uidplus_data` is set to `:up_to_max_size`,
ResponseParser uses UIDPlusData when the `uid-set` size is below
`parser_max_deprecated_uidplus_data_size`.  Above that size,
ResponseParser uses AppendUIDData or CopyUIDData.

This option is now the default for v0.5.

lib/net/imap/config.rb

@@ -313,10 +313,15 @@ def self.[](config)
       # [+true+ <em>(original default)</em>]
       #    ResponseParser only uses UIDPlusData.
       #
+      # [+:up_to_max_size+ <em>(default since +v0.5.6+)</em>]
+      #    ResponseParser uses UIDPlusData when the +uid-set+ size is below
+      #    parser_max_deprecated_uidplus_data_size.  Above that size,
+      #    ResponseParser uses AppendUIDData or CopyUIDData.
+      #
       # [+false+ <em>(planned default for +v0.6+)</em>]
       #    ResponseParser _only_ uses AppendUIDData and CopyUIDData.
       attr_accessor :parser_use_deprecated_uidplus_data, type: [
-        true, false
+        true, :up_to_max_size, false
       ]
 
       # The maximum +uid-set+ size that ResponseParser will parse into
@@ -423,7 +428,7 @@ def defaults_hash
         sasl_ir: true,
         enforce_logindisabled: true,
         responses_without_block: :warn,
-        parser_use_deprecated_uidplus_data: true,
+        parser_use_deprecated_uidplus_data: :up_to_max_size,
         parser_max_deprecated_uidplus_data_size: 100,
       ).freeze
 

lib/net/imap/response_parser.rb

@@ -2030,7 +2030,7 @@ def DeprecatedUIDPlus(validity, src_uids = nil, dst_uids)
           src_uids &&= src_uids.each_ordered_number.to_a
           dst_uids   = dst_uids.each_ordered_number.to_a
           UIDPlusData.new(validity, src_uids, dst_uids)
-        else
+        elsif config.parser_use_deprecated_uidplus_data != :up_to_max_size
           parse_error("uid-set is too large: %d > %d", count, max)
         end
       end

test/net/imap/test_imap_response_parser.rb

@@ -236,6 +236,17 @@ def test_fetch_binary_and_binary_size
     assert_equal 100, uidplus.assigned_uids.size
   end
 
+  test "APPENDUID with parser_use_deprecated_uidplus_data = :up_to_max_size" do
+    parser = Net::IMAP::ResponseParser.new(config: {
+      parser_use_deprecated_uidplus_data:      :up_to_max_size,
+      parser_max_deprecated_uidplus_data_size: 100
+    })
+    response = parser.parse("A004 OK [APPENDUID 1 101:200] Done\r\n")
+    assert_instance_of Net::IMAP::UIDPlusData, response.data.code.data
+    response = parser.parse("A004 OK [APPENDUID 1 100:200] Done\r\n")
+    assert_instance_of Net::IMAP::AppendUIDData, response.data.code.data
+  end
+
   test "APPENDUID with parser_use_deprecated_uidplus_data = false" do
     parser = Net::IMAP::ResponseParser.new(config: {
       parser_use_deprecated_uidplus_data:      false,
@@ -302,6 +313,19 @@ def test_fetch_binary_and_binary_size
     assert_equal 100, uidplus.source_uids.size
   end
 
+  test "COPYUID with parser_use_deprecated_uidplus_data = :up_to_max_size" do
+    parser = Net::IMAP::ResponseParser.new(config: {
+      parser_use_deprecated_uidplus_data:      :up_to_max_size,
+      parser_max_deprecated_uidplus_data_size: 100
+    })
+    response = parser.parse("A004 OK [COPYUID 1 101:200 1:100] Done\r\n")
+    copyuid = response.data.code.data
+    assert_instance_of Net::IMAP::UIDPlusData, copyuid
+    response = parser.parse("A004 OK [COPYUID 1 100:200 1:101] Done\r\n")
+    copyuid = response.data.code.data
+    assert_instance_of Net::IMAP::CopyUIDData, copyuid
+  end
+
   test "COPYUID with parser_use_deprecated_uidplus_data = false" do
     parser = Net::IMAP::ResponseParser.new(config: {
       parser_use_deprecated_uidplus_data:      false,