From 0a09ce0f7546a040c6c69a0cfe3b2221ed5a9685 Mon Sep 17 00:00:00 2001
From: Konstantinos Sideris <sideris.konstantin@gmail.com>
Date: Tue, 27 Mar 2018 21:07:39 +0300
Subject: [PATCH] Update first & last sender after message deletion

fixes #282
---
 include/timeline/TimelineView.h |  3 +++
 src/timeline/TimelineView.cc    | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/timeline/TimelineView.h b/include/timeline/TimelineView.h
index bec23cca..b38d6a7d 100644
--- a/include/timeline/TimelineView.h
+++ b/include/timeline/TimelineView.h
@@ -154,8 +154,11 @@ private:
         TimelineEvent findFirstViewableEvent(const std::vector<TimelineEvent> &events);
         TimelineEvent findLastViewableEvent(const std::vector<TimelineEvent> &events);
 
+        //! Mark the last event as read.
         void readLastEvent() const;
+        //! Whether or not the scrollbar is visible (non-zero height).
         bool isScrollbarActivated() { return scroll_area_->verticalScrollBar()->value() != 0; }
+        //! Retrieve the event id of the last item.
         QString getLastEventId() const;
         QString getEventSender(const mtx::events::collections::TimelineEvents &event) const;
         mtx::events::EventType getEventType(
diff --git a/src/timeline/TimelineView.cc b/src/timeline/TimelineView.cc
index ce6b061a..a00f4df5 100644
--- a/src/timeline/TimelineView.cc
+++ b/src/timeline/TimelineView.cc
@@ -753,6 +753,20 @@ TimelineView::removeEvent(const QString &event_id)
                 prevLabel->deleteLater();
         }
 
+        // If we deleted the last item in the timeline...
+        if (!nextItem && prevItem)
+                lastSender_ = prevItem->descriptionMessage().userid;
+
+        // If we deleted the first item in the timeline...
+        if (!prevItem && nextItem)
+                firstSender_ = nextItem->descriptionMessage().userid;
+
+        // If we deleted the only item in the timeline...
+        if (!prevItem && !nextItem) {
+                firstSender_.clear();
+                lastSender_.clear();
+        }
+
         // Finally remove the event.
         removedItem->deleteLater();
         eventIds_.remove(event_id);