Path: New feature - import base geometry from existing operations in Job

This feature allows the user to import base geometry from an existing operation in the same Job.  The imported geometry is still passed through the shape type filter as if it were manually selected in the viewport.
Path: Post-test updates

src/Mod/Path/PathScripts/PathOpGui.py

@@ -197,6 +197,7 @@ class TaskPanelPage(object):
         '''__init__(obj, features) ... framework initialisation.
         Do not overwrite, implement initPage(obj) instead.'''
         self.obj = obj
+        self.job = PathUtils.findParentJob(obj)
         self.form = self.getForm() # pylint: disable=assignment-from-no-return
         self.signalDirtyChanged = None
         self.setClean()
@@ -416,7 +417,30 @@ class TaskPanelBaseGeometryPage(TaskPanelPage):
         self.panelTitle = 'Base Geometry'
 
     def getForm(self):
-        return FreeCADGui.PySideUic.loadUi(":/panels/PageBaseGeometryEdit.ui")
+        panel = FreeCADGui.PySideUic.loadUi(":/panels/PageBaseGeometryEdit.ui")
+        self.modifyPanel(panel)
+        return panel
+
+    def modifyPanel(self, panel):
+        # Determine if possible operations are available
+        availableOps = list()
+        ops = self.job.Operations.Group
+        for op in ops:
+            if hasattr(op, 'Base') and op.Base.__len__() > 0:
+                availableOps.append(op.Label)
+
+        if availableOps.__len__() > 0:
+            # Populate the operations list
+            addInputs = True
+            panel.geometryImportList.blockSignals(True)
+            panel.geometryImportList.clear()
+            availableOps.sort()
+            for opLbl in availableOps:
+                panel.geometryImportList.addItem(opLbl)
+            panel.geometryImportList.blockSignals(False)
+        else:
+            panel.geometryImportList.hide()
+            panel.geometryImportButton.hide()
 
     def getTitle(self, obj):
         return translate("PathOp", "Base Geometry")
@@ -542,11 +566,23 @@ class TaskPanelBaseGeometryPage(TaskPanelPage):
         self.setDirty()
         self.updatePanelVisibility('Operation', self.obj)
 
+    def importBaseGeometry(self):
+        opLabel = str(self.form.geometryImportList.currentText())
+        ops = FreeCAD.ActiveDocument.getObjectsByLabel(opLabel)
+        if ops.__len__() > 1:
+            msg = translate('PathOpGui', 'Mulitiple operations are labeled as')
+            msg += " {}\n".format(opLabel)
+            FreeCAD.Console.PrintWarning(msg)
+        for (base, subList) in ops[0].Base:
+            FreeCADGui.Selection.addSelection(base, subList)
+        self.addBase()
+
     def registerSignalHandlers(self, obj):
         self.form.baseList.itemSelectionChanged.connect(self.itemActivated)
         self.form.addBase.clicked.connect(self.addBase)
         self.form.deleteBase.clicked.connect(self.deleteBase)
         self.form.clearBase.clicked.connect(self.clearBase)
+        self.form.geometryImportButton.clicked.connect(self.importBaseGeometry)
 
     def pageUpdateData(self, obj, prop):
         if prop in ['Base']: