Bug#961133: qcustomplot: buildtest-plot autopkgtest fails with Qt 5.14 because of deprecation warning

[Dmitry Shachnev]

Source: qcustomplot
Version: 2.0.1+dfsg1-1
Tags: patch
User: debian-qt-kde at lists.debian.org
Usertags: qt5.14

Dear Maintainer,

One of qcustomplot autopkgtests fails when run against Qt 5.14, currently
available in experimental. It fails because of stderr:

  [ 83%] Building CXX object CMakeFiles/plots.dir/mainwindow.cpp.o
  /tmp/tmp.vk2CMqIqRc/src/mainwindow.cpp: In member function ‘void MainWindow::realtimeDataSlot()’:
  /tmp/tmp.vk2CMqIqRc/src/mainwindow.cpp:1386:29: warning: ‘int QTime::elapsed() const’ is deprecated: Use QElapsedTimer instead [-Wdeprecated-declarations]
   1386 |   double key = time.elapsed()/1000.0; // time elapsed since start of demo, in seconds
        |                             ^
  In file included from /usr/include/x86_64-linux-gnu/qt5/QtCore/QDateTime:1,
                   from /usr/include/qcustomplot.h:61,
                   from /tmp/tmp.vk2CMqIqRc/src/mainwindow.h:47,
                   from /tmp/tmp.vk2CMqIqRc/src/mainwindow.cpp:42:
  /usr/include/x86_64-linux-gnu/qt5/QtCore/qdatetime.h:230:54: note: declared here
    230 |     QT_DEPRECATED_X("Use QElapsedTimer instead") int elapsed() const;
        |                                                      ^~~~~~~

Attached is a patch that changes the code to use QElapsedTimer, as suggested.
It works with Qt 5.12 too.

--
Dmitry Shachnev
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