hardcoded list of BTTV's christmas emotes

src/messages/MessageElement.hpp

@@ -103,6 +103,10 @@ enum class MessageElementFlag {
     LowercaseLink = (1 << 29),
     OriginalLink = (1 << 30),
 
+    // ZeroWidthEmotes are emotes that are supposed to overlay over any pre-existing emotes
+    // e.g. BTTV's SoSnowy during christmas season
+    ZeroWidthEmote = (1 << 31),
+
     Default = Timestamp | Badges | Username | BitsStatic | FfzEmoteImage |
               BttvEmoteImage | TwitchEmoteImage | BitsAmount | Text |
               AlwaysShow,

src/messages/layouts/MessageLayoutContainer.cpp

@@ -115,15 +115,27 @@ void MessageLayoutContainer::_addElement(MessageLayoutElement *element,
     // update line height
     this->lineHeight_ = std::max(this->lineHeight_, newLineHeight);
 
+    auto xOffset = 0;
+
+    if (element->getCreator().getFlags().has(
+            MessageElementFlag::ZeroWidthEmote))
+    {
+        xOffset -= element->getRect().width() + this->spaceWidth_;
+    }
+
     // set move element
-    element->setPosition(
+    element->setPosition(QPoint(this->currentX_ + xOffset,
-        QPoint(this->currentX_, this->currentY_ - element->getRect().height()));
+                                this->currentY_ - element->getRect().height()));
 
     // add element
     this->elements_.push_back(std::unique_ptr<MessageLayoutElement>(element));
 
     // set current x
-    this->currentX_ += element->getRect().width();
+    if (!element->getCreator().getFlags().has(
+            MessageElementFlag::ZeroWidthEmote))
+    {
+        this->currentX_ += element->getRect().width();
+    }
 
     if (element->hasTrailingSpace())
     {

src/providers/twitch/TwitchMessageBuilder.cpp

@@ -28,6 +28,10 @@
 
 namespace {
 
+const QStringList zeroWidthEmotes{
+    "SoSnowy", "IceCold", "SantaHat", "TopHat", "ReinDeer", "CandyCane",
+};
+
 QColor getRandomColor(const QVariant &userId)
 {
     static const std::vector<QColor> twitchUsernameColors = {
@@ -1162,6 +1166,11 @@ Outcome TwitchMessageBuilder::tryAppendEmote(const EmoteName &name)
     else if ((emote = globalBttvEmotes.emote(name)))
     {
         flags = MessageElementFlag::BttvEmote;
+
+        if (zeroWidthEmotes.contains(name.string))
+        {
+            flags.set(MessageElementFlag::ZeroWidthEmote);
+        }
     }
 
     if (emote)