Improve the file delegate

- cleaner code
- supports stopping downloads
- utilises the mimetype in order to display an icon
- better size formatting
- tooltips

src/controller.cpp

@@ -610,7 +610,7 @@ void Controller::openOrCreateDirectChat(NeoChatUser *user)
 
 QString Controller::formatByteSize(double size, int precision) const
 {
-    return KFormat().formatByteSize(size, precision);
+    return QLocale().formattedDataSize(size, precision);
 }
 
 QString Controller::formatDuration(quint64 msecs, KFormat::DurationFormatOptions options) const

src/messageeventmodel.cpp

@@ -37,6 +37,7 @@ QHash<int, QByteArray> MessageEventModel::roleNames() const
     roles[HighlightRole] = "isHighlighted";
     roles[SpecialMarksRole] = "marks";
     roles[LongOperationRole] = "progressInfo";
+    roles[FileMimetypeIcon] = "fileMimetypeIcon";
     roles[AnnotationRole] = "annotation";
     roles[EventResolvedTypeRole] = "eventResolvedType";
     roles[ReplyRole] = "reply";
@@ -536,6 +537,15 @@ QVariant MessageEventModel::data(const QModelIndex &idx, int role) const
         return m_currentRoom->isEventHighlighted(&evt);
     }
 
+    if (role == FileMimetypeIcon) {
+        auto e = eventCast<const RoomMessageEvent>(&evt);
+        if (!e || !e->hasFileContent()) {
+            return QVariant();
+        }
+
+        return e->content()->fileInfo()->mimeType.iconName();
+    }
+
     if (role == SpecialMarksRole) {
         if (isPending) {
             return pendingIt->deliveryStatus();

src/messageeventmodel.h

@@ -30,6 +30,8 @@ public:
         UserMarkerRole,
         FormattedBodyRole,
 
+        FileMimetypeIcon,
+
         ReplyRole,
 
         ShowAuthorRole,