GDAL Buffer Vectors; not possible to provide negative buffer distance

[MarByteBeep]

What is the bug or the crash?

The Buffer Distance field in Toolbox -> GDAL -> Buffer Vectors cannot be set to a negative value in the UI. However the tool itself (ogr2ogr) IS able to handle negative values properly.

Steps to reproduce the issue

• Open Toolbox -> GDAL -> Buffer Vectors
• Enter negative value in Buffer Distance field
• Observe it being set to 0.000

Versions

QGIS version
3.22.2-Białowieża
QGIS code revision
1601ec4
Qt version
5.15.2
Python version
3.9.5
GDAL/OGR version
3.4.0
PROJ version
8.2.0
EPSG Registry database version
v10.038 (2021-10-21)
GEOS version
3.10.0-CAPI-1.16.0
SQLite version
3.35.2
PDAL version
2.3.0
PostgreSQL client version
13.0
SpatiaLite version
5.0.1
QWT version
6.1.3
QScintilla2 version
2.11.5
OS version
Windows 10 Version 2009

Active Python plugins
BGTImport
3.16
inspireNL
2.6
QuickOSM
2.0.0
quick_map_services
0.19.27
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.5
processing
2.12.99
sagaprovider
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

No response

[baswein]

I tried this on widows in both 3.16 and 3.22 and both set the value back to 0 when entering a negative number. The native qgis buffer worked with negative numbers. I see that the distance minValue in C:\OSGeo4W64\apps\qgis-ltr\python\plugins\processing\algs\gdal\Buffer.py is set to zero. If I change it to -10000 I can use negative numbers and the algorithm works. Is there a reason that it is set to 0?

[MarByteBeep]

Awesome. Tnx!