bug in filebrowser: Copy/paste of 2 files leads to content swap

[jhgoebbert]

Description

If one has two files called test-Copy.file and test.file in a directory and uses the context menu's Copy and Paste to copy them to another directory

1. the content of the files is swapped

2. test-Copy.file gets renamed to test-Copy1.file

Reproduce

1. create two files called test.file and test-Copy.file
2. give both a different content
3. select both in the JupyterLab filebrowser
4. use the context menu of the JupyterLab filebowser to click "Copy"
5. open a different directory
6. use the context menu of the JupyterLab filebowser to click "Paste"

The filecontent will be swapped and the filename test-Copy.file will be test-Copy1.file

Expected behavior

file-content is not swapped and file-names are not changed

Context

• Operating System and version: Windows 10
• Browser and version: Firefox 98.01
• JupyterLab version: 3.2.1 and 3.3.2

[JasonWeill]

In #12236, test-Copy.file appears to be getting renamed to test.file. In this example, test.file appears to be getting renamed to test-Copy1.file.

Not sure if this represents distinct work from #12236. The "rename on copy/paste" logic might need to be rewritten or removed to address both of these bugs.