Fix smooth scrolling when ChannelView is full (#4501)

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

src/widgets/helper/ChannelView.hpp

@@ -260,7 +260,6 @@ private:
 
     QTimer updateTimer_;
     bool updateQueued_ = false;
-    bool messageWasAdded_ = false;
     bool lastMessageHasAlternateBackground_ = false;
     bool lastMessageHasAlternateBackgroundReverse_ = true;
 
@@ -269,7 +268,8 @@ private:
     std::unordered_map<PauseReason, boost::optional<SteadyClock::time_point>>
         pauses_;
     boost::optional<SteadyClock::time_point> pauseEnd_;
-    int pauseScrollOffset_ = 0;
+    int pauseScrollMinimumOffset_ = 0;
+    int pauseScrollMaximumOffset_ = 0;
     // Keeps track how many message indices we need to offset the selection when we resume scrolling
     uint32_t pauseSelectionOffset_ = 0;