[BUG] When a file is deleted in the history view, you cannot do right-click -> View file history

[ozmium]

This is the context menu option to view the File History, using SourceGit 8.27:

The problem is that this menu option is missing in several scenarios.

Example commit in this SourceGit repo:

• "project: cleanup", f544333, 2024/08/14 09:32:58

The menu option is missing for three different situations:

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1. File History is not displayed for a deleted file, in the Git history view

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2. File history is not displayed for a modified Staged file (before it's committed to Git)

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3. File history is not displayed for a deleted Staged file

The expected result is that the File History option should be available in all these situations, because a user may want to view the file history in these situations. Also, other Git clients will show a 'View File History' option in these situations.