SL-19801 Log unicode characters for debug

indra/llcommon/llstring.cpp

@@ -365,6 +365,30 @@ S32 wchar_utf8_length(const llwchar wc)
 	}
 }
 
+std::string wchar_utf8_preview(const llwchar wc)
+{
+    std::ostringstream oss;
+    oss << std::hex << std::uppercase << (U32)wc;
+
+    U8 out_bytes[8];
+    U32 size = (U32)wchar_to_utf8chars(wc, (char*)out_bytes);
+
+    if (size > 1)
+    {
+        oss << " [";
+        for (U32 i = 0; i < size; ++i)
+        {
+            if (i)
+            {
+                oss << ", ";
+            }
+            oss << (int)out_bytes[i];
+        }
+        oss << "]";
+    }
+
+    return oss.str();
+}
 
 S32 wstring_utf8_length(const LLWString& wstr)
 {

indra/llcommon/llstring.h

@@ -682,6 +682,8 @@ LL_COMMON_API S32 wstring_utf8_length(const LLWString& wstr);
 // Length in bytes of this wide char in a UTF8 string
 LL_COMMON_API S32 wchar_utf8_length(const llwchar wc); 
 
+LL_COMMON_API std::string wchar_utf8_preview(const llwchar wc);
+
 LL_COMMON_API std::string utf8str_tolower(const std::string& utf8str);
 
 // Length in llwchar (UTF-32) of the first len units (16 bits) of the given UTF-16 string.

indra/llui/lltexteditor.cpp

@@ -682,6 +682,7 @@ void LLTextEditor::selectByCursorPosition(S32 prev_cursor_pos, S32 next_cursor_p
 
 void LLTextEditor::insertEmoji(llwchar emoji)
 {
+	LL_INFOS() << "LLTextEditor::insertEmoji(" << wchar_utf8_preview(emoji) << ")" << LL_ENDL;
 	auto styleParams = LLStyle::Params();
 	styleParams.font = LLFontGL::getFontEmoji();
 	auto segment = new LLEmojiTextSegment(new LLStyle(styleParams), mCursorPos, mCursorPos + 1, *this);

indra/llui/llview.cpp

@@ -1024,7 +1024,7 @@ BOOL LLView::handleUnicodeChar(llwchar uni_char, BOOL called_from_parent)
 			handled = handleUnicodeCharHere(uni_char);
 			if (handled && LLView::sDebugKeys)
 			{
-				LL_INFOS() << "Unicode key handled by " << getName() << LL_ENDL;
+				LL_INFOS() << "Unicode key " << wchar_utf8_preview(uni_char) << " is handled by " << getName() << LL_ENDL;
 			}
 		}
 	}