[issue41765] XFCE task switcher shows 'Tk' insteadl of Window title

[Mark Summerfield]

New submission from Mark Summerfield <mark at qtrac.eu>:

This tiny test application illustrates the problem:
```python
#!/usr/bin/env python3
import tkinter as tk
app = tk.Tk()
app.withdraw()
app.title('Test App')
app.deiconify()
app.mainloop()
```
When run on Linux with XFCE the task bar entry shows the text 'Test App', but the task switcher shows 'Tk' rather than the title text.

----------
components: Tkinter
messages: 376745
nosy: mark
priority: normal
severity: normal
status: open
title: XFCE task switcher shows 'Tk' insteadl of Window title
type: behavior
versions: Python 3.6, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41765>
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