FIX: eat all leading spaces llms provide when they stream them

Author: SamSaffron

lib/ai_bot/chat_streamer.rb

@@ -53,7 +53,9 @@ def <<(partial)
         if @reply
           @queue << partial
         else
-          create_reply(partial)
+          # we throw away leading spaces prior to message creation for now
+          # by design
+          create_reply(partial) if partial.present?
         end
       end
 

spec/lib/modules/ai_bot/playground_spec.rb

@@ -354,7 +354,7 @@
           )
 
         prompts = nil
-        DiscourseAi::Completions::Llm.with_prepared_responses(["world"]) do |_, _, _prompts|
+        DiscourseAi::Completions::Llm.with_prepared_responses([[" ", "world"]]) do |_, _, _prompts|
           message =
             ChatSDK::Message.create(
               channel_id: channel.id,
@@ -386,6 +386,9 @@
         TEXT
 
         expect(content.strip).to eq(expected)
+
+        reply = Chat::Message.order(:id).last
+        expect(reply.message).to eq("world")
       end
 
       it "should reply to a mention if properly enabled" do