fix scroll to bottom issue

src/widgets/chatwidgetview.cpp

@@ -112,7 +112,7 @@ bool ChatWidgetView::layoutMessages()
 
     _scrollbar.setMaximum(messages.getSize());
 
-    if (showingLatestMessages && showScrollbar) {
+    if (this->showingLatestMessages && showScrollbar) {
         // If we were showing the latest messages and the scrollbar now wants to be rendered, scroll
         // to bottom
         // TODO: Do we want to check if the user is currently moving the scrollbar?

src/widgets/scrollbar.cpp

@@ -96,7 +96,7 @@ void ScrollBar::scrollToBottom()
 
 bool ScrollBar::isAtBottom() const
 {
-    return this->getCurrentValue() == this->getMaximum() - this->getLargeChange();
+    return ((this->getMaximum() - this->getLargeChange()) - this->getCurrentValue()) <= 1;
 }
 
 void ScrollBar::setMaximum(qreal value)