A bit more intuitive adding drawing/schedule to the sheet

Now it will detect currently active sheet even if you have sheet's drawing/titleblock/schedule selected.

src/blenderbim/blenderbim/bim/module/drawing/operator.py

@@ -1034,7 +1034,7 @@ class AddDrawingToSheet(bpy.types.Operator, Operator):
     def _execute(self, context):
         props = context.scene.DocProperties
         active_drawing = props.drawings[props.active_drawing_index]
-        active_sheet = props.sheets[props.active_sheet_index]
+        active_sheet = tool.Drawing.get_active_sheet(context)
         drawing = tool.Ifc.get().by_id(active_drawing.ifc_definition_id)
         drawing_reference = tool.Drawing.get_drawing_document(drawing)
 
@@ -1574,7 +1574,7 @@ class AddScheduleToSheet(bpy.types.Operator, Operator):
     def _execute(self, context):
         props = context.scene.DocProperties
         active_schedule = props.schedules[props.active_schedule_index]
-        active_sheet = props.sheets[props.active_sheet_index]
+        active_sheet = tool.Drawing.get_active_sheet(context)
         schedule = tool.Ifc.get().by_id(active_schedule.ifc_definition_id)
         if tool.Ifc.get_schema() == "IFC2X3":
             schedule_location = tool.Drawing.get_path_with_ext(schedule.DocumentReferences[0].Location, "svg")

src/blenderbim/blenderbim/tool/drawing.py

@@ -671,6 +671,11 @@ class Drawing(blenderbim.core.tool.Drawing):
                 new.name = os.path.basename(reference.Location)
                 new.reference_type = reference.Description
 
+    @classmethod
+    def get_active_sheet(cls, context):
+        props = context.scene.DocProperties
+        return next(s for s in props.sheets[: props.active_sheet_index + 1][::-1] if s.is_sheet)
+
     @classmethod
     def import_text_attributes(cls, obj):
         props = obj.BIMTextProperties