Map tools: Select Features by single click always selects only 1 feature instead of all the overlapping features

[agiudiceandrea]

What is the bug or the crash?

When the "Select Features by area or single click" map tool is used "by single click", then it always selects only 1 feature, even if there are more than 1 overlapping features.

This behaviour is different from the one of the same tool when it is used "by area", or from the one of all the other "Select Features" map tool: all the overlapping features are always selected.

Steps to reproduce the issue

1. Add to the map or create a polygon vector layer containing overlapping polygons
2. select the "Select Features by area or single click" map tool and click on a point on the map which is contained by multiple polygon features
3. observe that only 1 polygon feature is select instead of all the polygon features that contain the clicked point

Versions

QGIS 3.40.2 / QGIS 3.34.14 on Windows 10

QGIS version	3.40.2-Bratislava
QGIS code revision	14826ca1
Libraries
Qt version	5.15.13
Python version	3.12.8
GDAL/OGR version	3.9.3
PROJ version	9.5.0
EPSG Registry database version	v11.016 (2024-08-31)
GEOS version	3.13.0-CAPI-1.19.0
SQLite version	3.46.1
PDAL version	2.8.1
PostgreSQL client version	16.2
SpatiaLite version	5.1.0
QWT version	6.3.0
QScintilla2 version	2.14.1
OS version	Windows 10 Version 1903
Active Python plugins
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

Not sure if such behaviour is intended or not.

The corresponding "Identify Feature(s) by single click" map tool correctly identifies all the polygon features that contain the clicked point.

The docs don't look like containing a mention of any different behaviour of the "Select Features" by single click map tool.

[lbartoletti]

@agiudiceandrea From an old CAD user, I think it's by design and not a bug.

For this simple case :

Clicking inside id = 3 polygon, could select the three polygons, however, using the single click, is like, "I want the 'last'/'superior' polygon".

However, one can consider as a bug, the single click, which doesn't respect the "control feature rendering order"

Here, the id = 3 is still the selected polygon. So, my "assumption" : "I want the 'last'/'superior' polygon", is eventually "I want the 'last' polygon" whatever the rendering order. Is it a bug? Maybe