Add ability to disable delayed resize event

[fpalazzolo]

The delayed resize event might help with large datasets, but it makes the plot jump around. Setting the delay to zero doesn't make this go away either, because the timer mechanism is still enabled.

For my use case, I would like the resizing to be smooth. I propose the following change, which just bypasses the resize timer if the value is set to 0:

in jkqtplotter.cpp:

void JKQTPlotter::resizeEvent(QResizeEvent *event) {
#ifdef JKQTBP_AUTOTIMER
    JKQTPAutoOutputTimer jkaaot(QString("JKQTPlotter::resizeEvent()"));
#endif
    //qDebug()<<"resizeEvent  old="<<size()<<"   new="<<event->size();
     QWidget::resizeEvent(event);
     event->accept();

     // NEW CODE STARTS HERE
     if (jkqtp_RESIZE_DELAY == 0) {
         emit widgetResized(width(), height(), this);
         redrawPlot();
         return;
     }
     // NEW CODE ENDS HERE

I can create a pull request if needed/desired

[fpalazzolo]

I'm sorry, that last bit of code was incorrect. A working addition is here...

in jkqtplotter.cpp, at the bottom of resizeEvent(), change:

     if (sizeChanged) {
        resizeTimer.setSingleShot(true);
        resizeTimer.start(jkqtp_RESIZE_DELAY);
     }

to

     if (sizeChanged) {
        if (jkqtp_RESIZE_DELAY == 0) {
            // Do this now
            delayedResizeEvent();
        } else {
            resizeTimer.setSingleShot(true);
            resizeTimer.start(jkqtp_RESIZE_DELAY);
        }
     }

[jkriege2]

Hi! that sounds like a good idea ... and I would be happy to receive a PR ... Could you also explain this in the documentation of jkqtp_RESIZE_DELAY? Thanks, JAN