allow to copy a file/folder into its own folder -> makes a copy

[tobiasKaminsky]

Testing

• select a file, e.g. "test.pdf"

• copy it to its own folder

• see "test (2).pdf"

• select a folder, "test"

• copy it to its own folder

• see "test (2)"

• Tests written, or not not needed

[alperozturk96]

Tested, working.

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	59	59
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	65	65
Correctness	62	62
Dodgy code	296	296
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	1	1
Multithreaded correctness	6	6
Performance	53	53
Security	18	18
Total	509	509