Add settings to increase split and usercard scrollback (#3811)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/helper/ChannelView.cpp

@@ -137,12 +137,14 @@ namespace {
     }
 }  // namespace
 
-ChannelView::ChannelView(BaseWidget *parent, Split *split, Context context)
+ChannelView::ChannelView(BaseWidget *parent, Split *split, Context context,
+                         size_t messagesLimit)
     : BaseWidget(parent)
     , split_(split)
     , scrollBar_(new Scrollbar(this))
     , highlightAnimation_(this)
     , context_(context)
+    , messages_(messagesLimit)
 {
     this->setMouseTracking(true);
 

src/widgets/helper/ChannelView.hpp

@@ -71,7 +71,8 @@ public:
     };
 
     explicit ChannelView(BaseWidget *parent = nullptr, Split *split = nullptr,
-                         Context context = Context::None);
+                         Context context = Context::None,
+                         size_t messagesLimit = 1000);
 
     void queueUpdate();
     Scrollbar &getScrollBar();