Fix #681

When minimized to tray, if a popup is closed, Qt notices that the last window is closed and exits. Tel Tell friend request dialogs to not exit on close

src/widget/tool/friendrequestdialog.cpp

@@ -26,6 +26,7 @@
 FriendRequestDialog::FriendRequestDialog(QWidget *parent, const QString &userId, const QString &message) :
     QDialog(parent)
 {
+    setAttribute(Qt::WA_QuitOnClose, false);
     setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
     setWindowTitle(tr("Friend request","Title of the window to aceept/deny a friend request"));