修复吞字问题

internal/sse/parser_test.go

@@ -88,6 +88,71 @@ func TestParseSSEChunkForContentAfterAppendUsesUpdatedType(t *testing.T) {
 	}
 }
 
+func TestParseSSEChunkForContentThinkingDisabledKeepsHiddenFragmentState(t *testing.T) {
+	chunk1 := map[string]any{
+		"p": "response/fragments",
+		"o": "APPEND",
+		"v": []any{
+			map[string]any{"type": "THINK", "content": "我们"},
+		},
+	}
+	parts1, finished1, nextType1 := ParseSSEChunkForContent(chunk1, false, "text")
+	if finished1 {
+		t.Fatal("expected first chunk unfinished")
+	}
+	if nextType1 != "thinking" {
+		t.Fatalf("expected hidden THINK fragment to keep next type thinking, got %q", nextType1)
+	}
+	if len(parts1) != 0 {
+		t.Fatalf("expected hidden thinking to be dropped, got %#v", parts1)
+	}
+
+	chunk2 := map[string]any{
+		"p": "response/fragments/-1/content",
+		"v": "被",
+	}
+	parts2, finished2, nextType2 := ParseSSEChunkForContent(chunk2, false, nextType1)
+	if finished2 {
+		t.Fatal("expected second chunk unfinished")
+	}
+	if nextType2 != "thinking" {
+		t.Fatalf("expected hidden continuation to keep next type thinking, got %q", nextType2)
+	}
+	if len(parts2) != 0 {
+		t.Fatalf("expected hidden continuation to be dropped, got %#v", parts2)
+	}
+
+	chunk3 := map[string]any{"v": "要求"}
+	parts3, finished3, nextType3 := ParseSSEChunkForContent(chunk3, false, nextType2)
+	if finished3 {
+		t.Fatal("expected third chunk unfinished")
+	}
+	if nextType3 != "thinking" {
+		t.Fatalf("expected pathless hidden continuation to keep next type thinking, got %q", nextType3)
+	}
+	if len(parts3) != 0 {
+		t.Fatalf("expected pathless hidden continuation to be dropped, got %#v", parts3)
+	}
+
+	chunk4 := map[string]any{
+		"p": "response/fragments",
+		"o": "APPEND",
+		"v": []any{
+			map[string]any{"type": "RESPONSE", "content": "答"},
+		},
+	}
+	parts4, finished4, nextType4 := ParseSSEChunkForContent(chunk4, false, nextType3)
+	if finished4 {
+		t.Fatal("expected fourth chunk unfinished")
+	}
+	if nextType4 != "text" {
+		t.Fatalf("expected RESPONSE fragment to switch next type text, got %q", nextType4)
+	}
+	if len(parts4) != 1 || parts4[0].Type != "text" || parts4[0].Text != "答" {
+		t.Fatalf("expected visible response text, got %#v", parts4)
+	}
+}
+
 func TestParseSSEChunkForContentAutoTransitionsThinkClose(t *testing.T) {
 	chunk := map[string]any{
 		"p": "response/thinking_content",