QGIS3 ZoomToSelected() not working in QGIS Editor Script but works in Python Console

Question

Using 3.10.1-A Coruña on Windows 10

I am writing a Python Script in the QGIS Editor but iface.mapCanvas().zoomToSelected() does not appear to be working at all in the Editor.

iface.mapCanvas().zoomToSelected() - works fine in the Python Console

Editor code - apparently does nothing

selectid = [2]
poalayer.select(selectid)
iface.mapCanvas().zoomToSelected() # does nothing
iface.mapCanvas().refresh();

Console - works as expected

iface.mapCanvas().zoomToSelected()

Let me know if I can provide any further info or do a test.

Added additional info: There's something obviously wrong here. From this reply (QGIS: Zoom to selected feature via plugin doesn't works in first attempt) I tried running my script a second time in the same session and it worked.

Answer 1

I tried in the console, in the editor and in a plugin and everything works very well.

The code in the console:

iface.mapCanvas().zoomToSelected()

The code in the editor:

layer = iface.activeLayer()
selectid = [2]
layer.select(selectid)
iface.mapCanvas().zoomToSelected()

The code in the plugin:

# At the beginning 
import qgis.utils
from qgis.utils import iface

# In run() function. I added a pushbutton.
self.dlg.pushButton.clicked.connect(self.zoom_canvas)
self.dlg.show()

# The function when I press on the push button (after run() function)
def zoom_canvas(self):
    iface.mapCanvas().zoomToSelected()