Issue with DataViewer when removing views

[malte-storm]

When I remove a registered view from the silx.gui.data.DataViewer.DataViewer using the removeView method, the display breaks down after switching between views, see the image below for the display of an 3D volume as image stack

A minimum code example is given below (with debugging prints). The reason is that the DataViewer.__getStackIndex method always calls the __stack.addWidget method of the QStackedWidget when the view is not listed in the __index (which is invalidated after the call to removeView). The addWidget always appends the given widget to the end of the QStackedWidgets list which moves all other widgets "up" in the list without updating the index.

from qtpy import QtWidgets

from silx.gui.data.DataViewer import DataViewer
from silx.gui.data import DataViews
import numpy as np

def get_view_indices(viewer):
    return {
        v.__class__.__name__: (
            viewer._DataViewer__stack.indexOf(v.getWidget()),
            viewer._DataViewer__index.get(v, "None"),
        ) for v in viewer.availableViews()
    }

if __name__ == "__main__":
    data = np.random.random((100, 100, 10))
    app = QtWidgets.QApplication([])
    viewer = DataViewer()

    viewer.setData(data)
    # Force creation of views
    for v in viewer.currentAvailableViews():
        viewer.setDisplayedView(v)

    for v in viewer.availableViews():
        if v.__class__.__name__ == "_ImageView":
            viewer.removeView(v)

    viewer.show()

    viewer.setData(data)
    print(get_view_indices(viewer))
    viewer.setDisplayMode(DataViews.STACK_MODE)
    print(get_view_indices(viewer))
    viewer.setDisplayMode(DataViews.PLOT1D_MODE)
    print(get_view_indices(viewer))
    viewer.setDisplayMode(DataViews.STACK_MODE)
    print(get_view_indices(viewer))
    app.exec()

[t20100]

closed by #4131