Qt: Don't use QMap::first or ::last

QMap::first and ::last were added in Qt 5.2.

Change-Id: I63bbb384aa75910bb96d8f75185ae90444b6c127
Reviewed-on: https://code.wireshark.org/review/15576
Reviewed-by: Gerald Combs <gerald@wireshark.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/ui/qt/sequence_diagram.cpp b/ui/qt/sequence_diagram.cpp
index 0dd6629277..57702ad098 100644
--- a/ui/qt/sequence_diagram.cpp
+++ b/ui/qt/sequence_diagram.cpp
@@ -112,8 +112,13 @@ int SequenceDiagram::adjacentPacket(bool next)
     if (data_->size() < 1) return adjacent_packet;
 
     if (selected_packet_ < 1) {
-        WSCPSeqData &data = next ? data_->first() : data_->last();
-        return data.value->frame_number;
+        if (next) {
+            it = data_->constBegin();
+        } else {
+            it = data_->constEnd();
+            --it;
+        }
+        return it.value().value->frame_number;
     }
 
     if (next) {