[processing] Correctly set parent widgets for algorithm dialogs

to avoid dialogs immediately going out of scope and being garbage
collected

(cherry picked from commit 07dc782)

python/plugins/processing/ProcessingPlugin.py

@@ -43,6 +43,7 @@
 from qgis.PyQt.QtCore import Qt, QCoreApplication, QDir, QFileInfo
 from qgis.PyQt.QtWidgets import QMenu, QAction
 from qgis.PyQt.QtGui import QIcon, QKeySequence
+from qgis.utils import iface
 
 from processing.core.Processing import Processing
 from processing.gui.AlgorithmDialog import AlgorithmDialog
@@ -86,7 +87,7 @@ def runAlg(file):
             return False
 
         alg.setProvider(QgsApplication.processingRegistry().providerById('model'))
-        dlg = AlgorithmDialog(alg)
+        dlg = AlgorithmDialog(alg, parent=iface.mainWindow())
         dlg.show()
         return True
 

python/plugins/processing/gui/AlgorithmLocatorFilter.py

@@ -95,9 +95,9 @@ def triggerResult(self, result):
                 dlg.setMessage(message)
                 dlg.exec_()
                 return
-            dlg = alg.createCustomParametersWidget(None)
+            dlg = alg.createCustomParametersWidget(parent=iface.mainWindow())
             if not dlg:
-                dlg = AlgorithmDialog(alg)
+                dlg = AlgorithmDialog(alg, parent=iface.mainWindow())
             canvas = iface.mapCanvas()
             prevMapTool = canvas.mapTool()
             dlg.show()
@@ -173,9 +173,9 @@ def triggerResult(self, result):
 
             if [d for d in alg.parameterDefinitions() if
                     d.name() not in ('INPUT', 'OUTPUT')]:
-                dlg = alg.createCustomParametersWidget(None)
+                dlg = alg.createCustomParametersWidget(parent=iface.mainWindow())
                 if not dlg:
-                    dlg = AlgorithmDialog(alg, True)
+                    dlg = AlgorithmDialog(alg, True, parent=iface.mainWindow())
                 canvas = iface.mapCanvas()
                 prevMapTool = canvas.mapTool()
                 dlg.show()

python/plugins/processing/gui/menus.py

@@ -250,9 +250,9 @@ def _executeAlgorithm(alg_id):
         return
 
     if (alg.countVisibleParameters()) > 0:
-        dlg = alg.createCustomParametersWidget(None)
+        dlg = alg.createCustomParametersWidget(parent=iface.mainWindow())
         if not dlg:
-            dlg = AlgorithmDialog(alg)
+            dlg = AlgorithmDialog(alg, parent=iface.mainWindow())
         canvas = iface.mapCanvas()
         prevMapTool = canvas.mapTool()
         dlg.show()

python/plugins/processing/modeler/ModelerDialog.py

@@ -487,7 +487,7 @@ def runModel(self):
             self.bar.pushMessage("", self.tr("Model doesn't contain any algorithm and/or parameter and can't be executed"), level=Qgis.Warning, duration=5)
             return
 
-        dlg = AlgorithmDialog(self.model)
+        dlg = AlgorithmDialog(self.model, parent=iface.mainWindow())
         dlg.exec_()
 
     def save(self):

python/plugins/processing/script/ScriptEditorDialog.py

@@ -248,9 +248,9 @@ def runAlgorithm(self):
         alg.setProvider(QgsApplication.processingRegistry().providerById("script"))
         alg.initAlgorithm()
 
-        dlg = alg.createCustomParametersWidget(self)
+        dlg = alg.createCustomParametersWidget(iface.mainWindow())
         if not dlg:
-            dlg = AlgorithmDialog(alg)
+            dlg = AlgorithmDialog(alg, parent=iface.mainWindow())
 
         canvas = iface.mapCanvas()
         prevMapTool = canvas.mapTool()

python/plugins/processing/tools/general.py

@@ -137,7 +137,7 @@ def createAlgorithmDialog(algOrName, parameters={}):
     dlg = alg.createCustomParametersWidget(iface.mainWindow())
 
     if not dlg:
-        dlg = AlgorithmDialog(alg)
+        dlg = AlgorithmDialog(alg, parent=iface.mainWindow())
 
     dlg.setParameters(parameters)