added some code for collapsing messages

src/widgets/helper/channelview.cpp

@@ -729,11 +729,19 @@ void ChannelView::mouseMoveEvent(QMouseEvent *event)
     QPoint relativePos;
     int messageIndex;
 
+    // no message under cursor
     if (!tryGetMessageAt(event->pos(), message, relativePos, messageIndex)) {
-        setCursor(Qt::ArrowCursor);
+        this->setCursor(Qt::ArrowCursor);
         return;
     }
 
+    // message under cursor is collapsed
+    if (message->isCollapsed()) {
+        this->setCursor(Qt::PointingHandCursor);
+        return;
+    }
+
+    // is selecting
     if (this->selecting) {
         int index = message->getSelectionIndex(relativePos);
 
@@ -742,16 +750,18 @@ void ChannelView::mouseMoveEvent(QMouseEvent *event)
         this->repaint();
     }
 
+    // check if word underneath cursor
     const messages::Word *hoverWord;
     if ((hoverWord = message->tryGetWordPart(relativePos)) == nullptr) {
-        setCursor(Qt::ArrowCursor);
+        this->setCursor(Qt::ArrowCursor);
         return;
     }
 
+    // check if word has a link
     if (hoverWord->getLink().isValid()) {
-        setCursor(Qt::PointingHandCursor);
+        this->setCursor(Qt::PointingHandCursor);
     } else {
-        setCursor(Qt::ArrowCursor);
+        this->setCursor(Qt::ArrowCursor);
     }
 }
 
@@ -787,6 +797,11 @@ void ChannelView::mousePressEvent(QMouseEvent *event)
         return;
     }
 
+    // check if message is collapsed
+    if (message->isCollapsed()) {
+        return;
+    }
+
     int index = message->getSelectionIndex(relativePos);
 
     auto selectionItem = SelectionItem(messageIndex, index);
@@ -831,6 +846,13 @@ void ChannelView::mouseReleaseEvent(QMouseEvent *event)
         return;
     }
 
+    // message under cursor is collapsed
+    if (message->isCollapsed()) {
+        message->setCollapsed(false);
+        this->layoutMessages();
+        return;
+    }
+
     const messages::Word *hoverWord;
 
     if ((hoverWord = message->tryGetWordPart(relativePos)) == nullptr) {