Commits on Sep 10, 2021

1. diff: enable and test the sparse index …

   Enable the sparse index within the 'git diff' command. Its implementation
   already safely integrates with the sparse index because it shares code with the
   'git status' and 'git checkout' commands that were already integrated. The most
   interesting thing to do is to add tests that verify that 'git diff' behaves
   correctly when the sparse index is enabled. These cases are...
   
   1. The index is not expanded for `diff` and `diff --staged` (which both
   involve reading from the index).
   2. `diff` and `diff --staged` behave the same in full
   checkout, sparse checkout, and sparse index repositories in the following
   partially-staged scenarios (i.e. the index, HEAD, and working directory
   differ at a given path):
       1. Path is within sparse-checkout cone.
       2. Path is outside sparse-checkout cone.
       3. A merge conflict exists for paths outside sparse-checkout cone.
   
   Signed-off-by: Lessley Dennington <lessleydennington@gmail.com>

   

   ldennington committed Sep 10, 2021
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