Reopening subWindow from buttom causes 'Duplicate widgetName' error

[ATrashInTheWorld]

Bug Report

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When I try to reopen a subWindow from a button, after closing it once, an error is thrown.

Context

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Replace this with a bit of background on what you're doing. I am trying to create an app that opens subWindows for different purposes. When the user is done, he closes the subWindow, and can reopen it to restart.

Expected Behaviour

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After closing the subWindow once, the user should be able to reopen it again.

Actual Behaviour

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After closing it once, an error is thrown and the subWindow does not reopen when I click the button.

Any error messages produced by appJar

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Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File "/home/dragonbug/.local/lib/python3.6/site-packages/appJar/appjar.py", line 3783, in <lambda>
    return lambda *args: funcName(param)
  File "/home/dragonbug/REPOS/japanesQuizzGenerator/src/GUI.py", line 53, in click
    createKanjiBank()
  File "/home/dragonbug/REPOS/japanesQuizzGenerator/src/GUI.py", line 29, in createKanjiBank
    app.startSubWindow("kanji", modal=True)
  File "/home/dragonbug/.local/lib/python3.6/site-packages/appJar/appjar.py", line 5680, in startSubWindow
    self.widgetManager.verify(WIDGET_NAMES.SubWindow, name)
  File "/home/dragonbug/.local/lib/python3.6/site-packages/appJar/appjar.py", line 15862, in verify
    raise ItemLookupError("Duplicate widgetName: " + widgetName)
appJar.appjar.ItemLookupError: Duplicate widgetName: kanji

Sample code, demonstrating the issue

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def createKanjiBank():
    print("create Kanji Bank")
    kanjiBank = []
    app.startSubWindow("kanji", modal=True)
    # app.setStopFunction(closeSubWindow)
    app.setSize(600,400)
    app.showSubWindow("kanji", "")
    # addToolBarButtons()
    app.addButton("+", addNewKanji)
    app.startScrollPane("Kanji Bank")
    for kanji in kanjiBank:
        app.addLabel(kanji.getKanji(), kanji.toString())

def click(button):
    if button == "Create new Kanji bank":
        createKanjiBank()

app = gui("Japanese Quizz Generator", "500x350")
app.addButton("Create new Kanji bank", click)
app.go()

What steps are needed to reproduce the bug

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• Start the app
• Click on the button
• close the subWindow
• Click on the button again

Version Information

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appJar: 0.94.0 Python: 3.6.9 TCL: 8.6, TK: 8.6 Platform: Linux pid: 28319
locale: en_CA