Setting XY Plot scale min/max from script requires multiple runs

[kasemir]

Configure an XY plot with a script like this:

# pvs[0] - minimum PV
# pvs[1] - maximum  PV
# pvs[2] - man/auto PV
# All configured to trigger the script
from org.csstudio.display.builder.runtime.script import PVUtil

widget.setPropertyValue('y_axes[0].autoscale', PVUtil.getLong(pvs[2]) > 0)
widget.setPropertyValue('y_axes[0].minimum',   PVUtil.getDouble(pvs[0]))
widget.setPropertyValue('y_axes[0].maximum',   PVUtil.getDouble(pvs[1]))
print("Set to %lf, %lf" % (PVUtil.getDouble(pvs[0]), PVUtil.getDouble(pvs[1])))

When enabling autoscale, the widget will immediately autoscale.
When disabling autoscale, however, the axis keeps its most recent limits.
Need to trigger the script once more, updating minimum and/or maximum once more, to get the desired manual min..max range

[kasemir]

Turns out this was added on purpose. When disabling autoscale, the axis min/max in the model is set to the current axis range to have the axis stay put, see XYPlotRepresentation:

    private void updateAxisRange(final Axis<Double> plot_axis, final AxisWidgetProperty model_axis)
    {
        if (model_axis.autoscale().getValue())
        {   // In auto-scale mode, don't update the value range because that would
            // result in flicker when both we and the auto-scaling adjust the range
            plot_axis.setAutoscale(true);
        }
        else
        {   // No auto-scale requested.
            if (plot_axis.setAutoscale(false))
            {   // Autoscale was on.
                // Turn off, and update model to the last range used by the plot
                final AxisRange<Double> range = plot_axis.getValueRange();
                changing_range = true;
                model_axis.minimum().setValue(range.getLow());
                model_axis.maximum().setValue(range.getHigh());
                changing_range = false;
            }
            else
                plot_axis.setValueRange(model_axis.minimum().getValue(), model_axis.maximum().getValue());
        }
    }

Works fine on a human scale: Disable autoscale, and plot range stays put. May now set axis minimum and/or maximum.
In a script that disables autosave, you now have to delay a little and then set the min/max.

Could update the XYPlotRepresentation to NOT update the model min/max; have the plot jump to the min/max range given in the model.

[kasemir]

This will hack around the behavior and force the range to be what we want

# pvs[0] - minimum PV
# pvs[1] - maximum  PV
# pvs[2] - man/auto PV
# All configured to trigger the script
from org.csstudio.display.builder.runtime.script import PVUtil
from time import sleep

au = PVUtil.getLong(pvs[2]) > 0
widget.setPropertyValue('y_axes[0].autoscale', au)
if not au:
    # Disabling autoscale will initially set the axis min/max to the last plot range
    # Wait, and then override with our desired range
    sleep(1)
    widget.setPropertyValue('y_axes[0].minimum',   PVUtil.getDouble(pvs[0]))
    widget.setPropertyValue('y_axes[0].maximum',   PVUtil.getDouble(pvs[1]))