[Backport queued_ltr_backports] Fix GRASS provider ignores default output vector format setting in Processing

python/plugins/grassprovider/Grass7AlgorithmProvider.py

@@ -133,27 +133,18 @@ def svgIconPath(self):
     def versionInfo(self):
         return Grass7Utils.installedVersion() or None
 
-    def defaultVectorFileExtension(self, hasGeometry=True):
-        # By default,'gpkg', but if OGR has not been compiled with sqlite3, then
-        # we take "SHP"
-        if 'GPKG' in [o.driverName for o in
-                      QgsVectorFileWriter.ogrDriverList()]:
-            return 'gpkg'
-        else:
-            return 'shp' if hasGeometry else 'dbf'
-
     def supportsNonFileBasedOutput(self):
         """
         GRASS7 Provider doesn't support non file based outputs
         """
         return False
 
     def supportedOutputVectorLayerExtensions(self):
-        # We use the same extensions than QGIS because:
+        # We use the same extensions as QGIS because:
         # - QGIS is using OGR like GRASS
-        # - There are very chances than OGR version used in GRASS is
+        # - There are very few chances that OGR version used in GRASS is
         # different from QGIS OGR version.
-        return QgsVectorFileWriter.supportedFormatExtensions()
+        return super().supportedOutputVectorLayerExtensions()
 
     def supportedOutputRasterLayerExtensions(self):
         return Grass7Utils.getSupportedOutputRasterExtensions()

python/plugins/grassprovider/Grass7Utils.py

@@ -601,7 +601,7 @@ def grassHelpPath():
 
     @staticmethod
     def getSupportedOutputRasterExtensions():
-        # We use the same extensions than GDAL because:
+        # We use the same extensions as GDAL because:
         # - GRASS is also using GDAL for raster imports.
         # - Chances that GRASS is compiled with another version of
         # GDAL than QGIS are very limited!