[#705] Change p4 diff options to allow detection of space changes

Author: mengdaming

src/vcs/p4/p4_impl.go

@@ -211,7 +211,7 @@ func (*p4Impl) UnStash(_ bool) error {
 // Diff returns the list of files modified since last commit with diff info for each file
 func (p *p4Impl) Diff() (diffs vcs.FileDiffs, err error) {
 	var p4Output []byte
-	p4Output, err = p.runP4("diff", "-f", "-Od", "-dw", "-ds", filepath.Join(p.baseDir, "/..."))
+	p4Output, err = p.runP4("diff", "-f", "-Od", "-dl", "-ds", filepath.Join(p.baseDir, "/..."))
 	if err != nil {
 		return nil, err
 	}

src/vcs/p4/p4_impl_test.go

@@ -127,7 +127,7 @@ func Test_p4_diff(t *testing.T) {
 			"",
 			nil,
 			false,
-			[]string{"diff", "-f", "-Od", "-dw", "-ds", filepath.Clean("/...")},
+			[]string{"diff", "-f", "-Od", "-dl", "-ds", filepath.Clean("/...")},
 			nil,
 		},
 		{"p4 diff command call fails",