If hover over ImageLayoutElement show the preview of image

src/widgets/helper/ChannelView.cpp

@@ -1217,9 +1217,32 @@ void ChannelView::mouseMoveEvent(QMouseEvent *event)
     }
     else
     {
+        auto imageLayoutElement =
+            dynamic_cast<const ImageLayoutElement *>(hoverLayoutElement);
+
+        if (imageLayoutElement && imageLayoutElement->pixmap()) {
+            QBuffer buffer;
+            const int width = imageLayoutElement->pixmap()->width();
+            const int height = imageLayoutElement->pixmap()->height();
+            imageLayoutElement->pixmap()->save(&buffer, "PNG");
+
+            // FIXME: Image inside of imageLayoutElement is not always the biggest
+            // FIXME: Inject image directly into tooltipWidget without base64 bs
+            // FIXME: Gifs are not animated
+            // FIXME: No way to opt-out
+
+            tooltipWidget->setText(
+                QString("<img src='data:image/png;base64,%1' /><br/>%2x%3<br/>%4")
+                .arg(QString(buffer.data().toBase64()))
+                .arg(imageLayoutElement->pixmap()->width())
+                .arg(imageLayoutElement->pixmap()->height())
+                .arg(tooltip));
+        } else {
+            tooltipWidget->setText(tooltip);
+        }
+
         tooltipWidget->moveTo(this, event->globalPos());
         tooltipWidget->setWordWrap(isLinkValid);
-        tooltipWidget->setText(tooltip);
         tooltipWidget->adjustSize();
         tooltipWidget->show();
         tooltipWidget->raise();