Difftool does not work with staged renamed file in FormCommit dialog

[hieuxlu]

Current behaviour

• When launching a difftool for a renamed file, the remote file (which is renamed locally) does not appear in any difftool (tried with Kdiff3, BC, VSCode)

Expected behaviour

• Difftool for renamed file should work like normal files, where a temporary remote file should exist.

Steps to reproduce

1. Rename a file
2. Stage all
3. Select the renamed file in commit window and press F3 (to launch external difftool)

Screenshots

Did this work in previous version of GitExtensions

• I think it should. I have never experienced this problem, and I've used Git Extensions for 5 years (thank you very much guys)
• It works in RevisionDiffControl

Environment

• Git Extensions 3.4.3.9999
• Build d4b0f48
• Git 2.28.0.windows.1
• Microsoft Windows NT 10.0.17763.0
• .NET Framework 4.8.4250.0
• DPI 144dpi (150% scaling)

Diagnostics

[hieuxlu]

I can start working on this issue.