Bug#1025777: qcustomplot: autopkgtest regression: collect2: error: ld returned 1 exit status

[Christoph Berg]

Re: Paul Gevers
> With a recent upload of qcustomplot the autopkgtest of qcustomplot fails in
> testing when that autopkgtest is run with the binary packages of qcustomplot
> from unstable.

I uploaded the pending changes as an NMU, plus ignoring a compiler
warning on stderr:

[ 66%] Building CXX object CMakeFiles/plots.dir/mainwindow.cpp.o
/tmp/tmp.T3AXT8d62g/src/mainwindow.cpp: In member function ‘void MainWindow::on_actionSave_Document_triggered()’:
/tmp/tmp.T3AXT8d62g/src/mainwindow.cpp:127:59: warning: ‘QRect QPrinter::pageRect() const’ is deprecated: Use pageLayout().paintRectPixels(resolution()) instead. [-Wdeprecated-declarations]
  127 |     ui->textEdit->document()->setPageSize(printer.pageRect().size());
      |                                           ~~~~~~~~~~~~~~~~^~
In file included from /usr/include/x86_64-linux-gnu/qt5/QtPrintSupport/qprintengine.h:45,
                 from /usr/include/x86_64-linux-gnu/qt5/QtPrintSupport/QtPrintSupport:14,
                 from /usr/include/qcustomplot.h:97,
                 from /tmp/tmp.T3AXT8d62g/src/qcpdocumentobject.h:34,
                 from /tmp/tmp.T3AXT8d62g/src/mainwindow.h:32,
                 from /tmp/tmp.T3AXT8d62g/src/mainwindow.cpp:26:
/usr/include/x86_64-linux-gnu/qt5/QtPrintSupport/qprinter.h:259:11: note: declared here
  259 |     QRect pageRect() const;
      |           ^~~~~~~~
[ 83%] Building CXX object CMakeFiles/plots.dir/qcpdocumentobject.cpp.o

NMU diff: https://salsa.debian.org/science-team/qcustomplot/-/merge_requests/5

Christoph