[#705] Change git diff options to allow detection of space changes

Author: mengdaming

src/vcs/git/git_impl.go

@@ -316,7 +316,7 @@ func (g *gitImpl) UnStash(keep bool) error {
 func (g *gitImpl) Diff() (diffs vcs.FileDiffs, err error) {
 	var gitOutput []byte
 	gitOutput, err = g.runGit("diff", "--numstat", "--ignore-cr-at-eol",
-		"--ignore-all-space", "--ignore-blank-lines", "HEAD")
+		"--ignore-blank-lines", "HEAD")
 	if err != nil {
 		return nil, err
 	}

src/vcs/git/git_impl_test.go

@@ -109,7 +109,7 @@ func Test_git_diff(t *testing.T) {
 			nil,
 			false,
 			[]string{
-				"diff", "--numstat", "--ignore-cr-at-eol", "--ignore-all-space", "--ignore-blank-lines", "HEAD"},
+				"diff", "--numstat", "--ignore-cr-at-eol", "--ignore-blank-lines", "HEAD"},
 			nil,
 		},
 		{"git diff command call fails",