In Qgis 3.34.4 / 3.38.3 vector layer saved as KML does not allow deleting of polygon features.

[beng-tang]

What is the bug or the crash?

In Qgis 3.34.4 / 3.38.3 vector layer saved as KML does not allow deleting of polygon features.
When a polygon feature is selected, the dustbin icon is greyed out. Pressing the delete key results in an error message saying Provider does not support deletion.

Steps to reproduce the issue

1. Open Qgis 3.34.4 / 3.38.3

2. Create a new scratch layer using the icon in the toolbar to do so. My layer settings are shown in the image below.
   

3. Draw some polygons using the icon in the toolbar to open the draw polygon function.

4. Save the layer as a KML file.
   

5. Select one of the polygons you drew in the layer you just saved as a KML file while the layer is still in edit mode.

6. Try to delete it by pressing Del.
   

Versions

<style type="text/css"> p, li { white-space: pre-wrap; } </style>

QGIS version	3.38.3-Grenoble	QGIS code revision	37f9e6e
Qt version	5.15.13
Python version	3.12.3
GDAL/OGR version	3.8.4
PROJ version	9.4.0
EPSG Registry database version	v11.004 (2024-02-24)
GEOS version	3.12.1-CAPI-1.18.1
SQLite version	3.45.1
PostgreSQL client version	16.4 (Ubuntu 16.4-0ubuntu0.24.04.2)
SpatiaLite version	5.1.0
QWT version	6.1.4
QScintilla2 version	2.14.1
OS version	Linux Mint 22
Active Python plugins
Group_and_Sort_Layers	1.2
DigitizingTools	1.5.2
MetaSearch	0.3.6
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99

QGIS version 3.38.3-Grenoble QGIS code revision [37f9e6e](https://github.com/qgis/QGIS/commit/37f9e6efeec) Qt version 5.15.13 Python version 3.12.3 GDAL/OGR version 3.8.4 PROJ version 9.4.0 EPSG Registry database version v11.004 (2024-02-24) GEOS version 3.12.1-CAPI-1.18.1 SQLite version 3.45.1 PostgreSQL client version 16.4 (Ubuntu 16.4-0ubuntu0.24.04.2) SpatiaLite version 5.1.0 QWT version 6.1.4 QScintilla2 version 2.14.1 OS version Linux Mint 22

Active Python plugins
Group_and_Sort_Layers
1.2
DigitizingTools
1.5.2
MetaSearch
0.3.6
db_manager
0.1.20
grassprovider
2.12.99
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

This happens in Qgis 3.34.4 (the Linux Mint repository version) and 3.38.3, running in Linux Mint 22

[agiudiceandrea]

Not sure if it is an actual missing capability of the GDAL/OGR LIBKML driver or if it is a bug in the QGIS OGR provider.

[rouault]

Not sure if it is an actual missing capability of the GDAL/OGR LIBKML driver

It was indeed lacking. Queue for GDAL 3.10 in OSGeo/gdal#10840