CentOS 7.6 64-bit, Wt 3.3.8
We have an application that allows a user to select (via WCheckBox) one or more sensors to be plotted in a WCartesianChart widget. Selecting a sensor creates a new column in the underlying WStandardItemModel. The column is then populated with the sensor data and the model header data associated with the column is assigned the sensor name (this becomes the series legend text). Next the new column is associated with a WDataSeries, and finally that series is added to the chart via chart->addSeries(series). When we do this, the column data is plotted fine and an entry for the sensor appears in the plot legend. So far, so good. That's all works great, but here's my problem.
When a user unchecks a sensor selection checkbox, the model column associated with that sensor is deleted from the model. When that happens, the series data also disappears from the plot but the sensor name is NOT removed from the chart's legend. I am a little confused on how this all works. The application runs exactly how I want it to run on CentOS 6 with Wt 3.3.0. Under 3.3.0, deleting the column from the model also appears to completely remove the associated series from the chart AND removes the associated label from the chart legend. But on Wt 3.3.8 the legend doesn't get cleaned up. So, for example, if I have a sensor "A" to plot, selecting its checkbox the first time adds "A" to the legend and plots the data. If I uncheck the checkbox, the plotted data disappears but the "A" label remains. If I then check the checkbox again, the plotted data returns but now there are two "A" entries in the legend (each assigned a different plot color). And I can keep doing that, building up more and more legend entries as I go.
Anyone know what I am doing wrong? I thought deleting the column the series was bound to would automatically clean up the series and remove all traces of it from the chart (i.e. remove its legend entry) and, under Wt 3.3.0 at least, that does seem to be the case. But not so under 3.3.8. I have tried to delete the series manually with chart->removeSeries(column) before removing the column from the model, but the resulting behavior is unstable. Sometimes it appears to work, sometimes it doesn't. Sometimes it removes the label ("A" in my example) from the legend, but leaves the little line color indicator on the legend.
Any help would be greatly appreciated!
