Try to repair #142

- cannot always reproduce it
- bandage: if old element number still >0: remove again
- add logging.debug to see number of children

CHANGELOG.md

@@ -7,7 +7,7 @@
 **Closed issues:**
 
 - Appearance options not used from saved state [\#125](https://github.com/PASTA-ELN/pasta-eln/issues/125)
-- Removing all colums from tables [\#116](https://github.com/PASTA-ELN/pasta-eln/issues/116)
+- Removing all columns from tables [\#116](https://github.com/PASTA-ELN/pasta-eln/issues/116)
 - Importing incorrect [\#115](https://github.com/PASTA-ELN/pasta-eln/issues/115)
 - Unidentified table cannot be opened [\#114](https://github.com/PASTA-ELN/pasta-eln/issues/114)
 - Checkboxes in project table view [\#113](https://github.com/PASTA-ELN/pasta-eln/issues/113)

pasta_eln/GUI/project.py

@@ -40,6 +40,10 @@ def projHeader(self) -> None:
     Initialize / Create header of page
     """
     self.docProj = self.comm.backend.db.getDoc(self.projID)
+    # remove if still there
+    for i in reversed(range(self.mainL.count())): #remove old
+      self.mainL.itemAt(i).widget().setParent(None)  # type: ignore
+    logging.debug('ProjectView elements at 2: %i',self.mainL.count())
     # TOP LINE includes name on left, buttons on right
     _, topLineL       = widgetAndLayout('H',self.mainL,'m')
     hidden, menuTextHidden = ('     \U0001F441', 'Mark project as shown') \
@@ -127,6 +131,7 @@ def change(self, projID:str, docID:str) -> None:
     #initialize
     for i in reversed(range(self.mainL.count())): #remove old
       self.mainL.itemAt(i).widget().setParent(None)  # type: ignore
+    logging.debug('ProjectView elements at 1: %i',self.mainL.count())
     if projID!='':
       self.projID         = projID
       self.taskID         = docID
@@ -145,11 +150,13 @@ def change(self, projID:str, docID:str) -> None:
         self.projHeader()
       else:
         rootItem.appendRow(self.iterateTree(node))
+    logging.debug('ProjectView elements at 3: %i',self.mainL.count())
     # self.tree.expandAll()
     if selectedIndex is not None:
       self.tree.selectionModel().select(selectedIndex, QItemSelectionModel.Select)
       self.tree.setCurrentIndex(selectedIndex)# Item(selectedItem)
     self.mainL.addWidget(self.tree)
+    logging.debug('ProjectView elements at 4: %i',self.mainL.count())
     if len(nodeHier.children)>0 and self.btnAddSubfolder is not None:
       self.btnAddSubfolder.setVisible(False)
     return