Show tooltip when hovering over an emoji text segment (currently will show its shortcode)

indra/llui/lltextbase.cpp

@@ -3557,6 +3557,20 @@ LLEmojiTextSegment::LLEmojiTextSegment(const LLColor4& color, S32 start, S32 end
 {
 }
 
+BOOL LLEmojiTextSegment::handleToolTip(S32 x, S32 y, MASK mask)
+{
+	if (mTooltip.empty())
+	{
+		LLWString emoji = getWText().substr(getStart(), getEnd() - getStart());
+		if (!emoji.empty())
+		{
+			mTooltip = LLEmojiHelper::instance().getToolTip(emoji[0]);
+		}
+	}
+
+	return LLNormalTextSegment::handleToolTip(x, y, mask);
+}
+
 //
 // LLOnHoverChangeableTextSegment
 //

indra/llui/lltextbase.h

@@ -187,6 +187,7 @@ class LLEmojiTextSegment : public LLNormalTextSegment
 	LLEmojiTextSegment(const LLColor4& color, S32 start, S32 end, LLTextBase& editor, BOOL is_visible = TRUE);
 
 	bool canEdit() const override { return false; }
+	BOOL handleToolTip(S32 x, S32 y, MASK mask);
 };
 
 // Text segment that changes it's style depending of mouse pointer position ( is it inside or outside segment)