Allow changing the map extent properly when showing the map

CHANGELOG.md

@@ -2,7 +2,8 @@
 
 ## Fixes
 
-* Allow using MagicMocks to mock layers without problems
+* [#53](https://github.com/GispoCoding/pytest-qgis/pull/53) Allow using MagicMocks to mock layers without problems
+* [#62](https://github.com/GispoCoding/pytest-qgis/pull/62) Allow changing the map extent properly when showing the map
 
 # Version 2.0.0 (29-11-2023)
 

src/pytest_qgis/pytest_qgis.py

@@ -317,6 +317,11 @@ def _show_qgis_dlg(common_settings: Settings, qgis_parent: QWidget) -> None:
     if not common_settings.qgis_init_disabled:
         qgis_parent.setWindowTitle("Test QGIS dialog opened by Pytest-qgis")
         qgis_parent.show()
+
+        # Process events each time layer a visible layer is added to
+        # be able to change the extent properly
+        assert _APP
+        QgsProject.instance().legendLayersAdded.connect(_APP.processEvents)
     elif common_settings.qgis_init_disabled:
         warnings.warn(
             "Cannot show QGIS map because QGIS is not initialized. "

tests/visual/test_show_map.py

@@ -126,3 +126,15 @@ def test_show_map_crs_change_to_4326_2(layer_polygon, layer_points, layer_polygo
     QgsProject.instance().addMapLayers(
         [layer_points, layer_polygon_3067, layer_polygon]
     )
+
+
+@pytest.mark.qgis_show_map(timeout=DEFAULT_TIMEOUT, zoom_to_common_extent=False)
+def test_show_map_should_not_keep_the_set_extent(
+    layer_polygon_3067, qgis_canvas, qgis_app
+):
+    QgsProject.instance().addMapLayer(layer_polygon_3067)
+    qgis_canvas.setExtent(QgsRectangle(475804, 7145949.5, 549226, 7219371.5))
+    # This triggers the map to set the extent based on the layer
+    # if events are not processed after adding the layer
+    qgis_app.processEvents()
+    assert qgis_canvas.extent().area() == pytest.approx(5390790084, abs=1e5)