Project-specific file encoding ignored in Git Diff output

I'm in the process of changing the file encoding of my project from my system's default encoding (CP1252) to UTF-8 so that my compiler better supports Qt5. Not all of my projects yet support UTF-8, so my global encoding is still System (CP1252).

When I view the Git Diff output by double-clicking on a file in the Git Commit dialog, my project-specific file encoding setting is ignored and it's using the global encoding instead. As a result, the non-ANSI symbols in my string literals look garbled after I run iconv. Changing the global file encoding to match my project fixes this.

Diff results with Project File Encoding = UTF-8 and Global File Encoding = System (CP1252):

Diff results with Project File Encoding = UTF-8 and Global File Encoding = UTF-8:

The latter is the correct result.