chatgui: add diagnostic logging for Windows emoji animation bug investigation

tools/chatgui/src/lottieicon.cpp

@@ -2,6 +2,7 @@
 #include <rlottie_capi.h>
 #include <zlib.h>
 #include <cstring>
+#include <cstdio>
 
 static QByteArray unpackGzip(const QByteArray &data) {
     if (data.isEmpty()) return {};
@@ -35,15 +36,21 @@ static QByteArray unpackGzip(const QByteArray &data) {
 
 LottieIcon::LottieIcon(const QByteArray &tgsData) {
     QByteArray json = unpackGzip(tgsData);
+    fprintf(stderr, "[DIAG LottieIcon] this=%p tgsSize=%d jsonSize=%d jsonEmpty=%d\n",
+            (void*)this, (int)tgsData.size(), (int)json.size(), (int)json.isEmpty());
     if (json.isEmpty()) return;
 
     m_jsonData = json;
     m_anim = lottie_animation_from_data(m_jsonData.constData(), "", "");
+    fprintf(stderr, "[DIAG LottieIcon] this=%p m_anim=%p jsonHead=%.60s\n",
+            (void*)this, (void*)m_anim, m_jsonData.constData());
     if (!m_anim) return;
 
     lottie_animation_get_size(m_anim, &m_w, &m_h);
     m_totalFrames = (int)lottie_animation_get_totalframe(m_anim);
     m_frameRate = lottie_animation_get_framerate(m_anim);
+    fprintf(stderr, "[DIAG LottieIcon] this=%p frames=%d size=%zux%zu\n",
+            (void*)this, m_totalFrames, m_w, m_h);
     if (m_totalFrames <= 0) m_totalFrames = 1;
     m_valid = true;
 }