gitk: added external diff file rename detection

[ToBoMi]

Changes since v1:

• Commit message ident
• Commit message line length

[gitgitgadget]

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Changes since v1:
- Fixed a typo in the commit message (found by ...)
- Added a code comment to ... as suggested by ...
...

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[gitgitgadget]

There are issues in commit 37f18d1:
gitk: Added external diff file rename detection
Prefixed commit message must be in lower case
Commit not signed off

[gitgitgadget]

There are issues in commit 383d90c:
gitk: Added external diff file rename detection
Prefixed commit message must be in lower case

[gitgitgadget]

Error: User ToBoMi is not yet permitted to use GitGitGadget

[dscho]

/allow

[dscho]

/allow

Just for the record (this was already accomplished in #1773).

[gitgitgadget]

User ToBoMi already allowed to use GitGitGadget.

[gitgitgadget]

Error: Could not determine full name of ToBoMi

[ToBoMi]

/preview

[gitgitgadget]

Preview email sent as [email protected]

[ToBoMi]

/preview

[gitgitgadget]

Preview email sent as [email protected]

[ToBoMi]

/submit

[gitgitgadget]

Submitted as [email protected]

To fetch this version into FETCH_HEAD:

git fetch https://github.com/gitgitgadget/git/ pr-1774/ToBoMi/detect_renamed_files_when_opening_diff-v1

To fetch this version to local tag pr-1774/ToBoMi/detect_renamed_files_when_opening_diff-v1:

git fetch --no-tags https://github.com/gitgitgadget/git/ tag pr-1774/ToBoMi/detect_renamed_files_when_opening_diff-v1

[ToBoMi]

/submit

[gitgitgadget]

Submitted as [email protected]

To fetch this version into FETCH_HEAD:

git fetch https://github.com/gitgitgadget/git/ pr-1774/ToBoMi/detect_renamed_files_when_opening_diff-v2

To fetch this version to local tag pr-1774/ToBoMi/detect_renamed_files_when_opening_diff-v2:

git fetch --no-tags https://github.com/gitgitgadget/git/ tag pr-1774/ToBoMi/detect_renamed_files_when_opening_diff-v2