Preserve backslashes within double quotes in CLIGitCommand::split()

Change-Id: Ia6a56512baa6a0f27e2eef1b19ebb60291ba377f
Signed-off-by: Rüdiger Herrmann <ruediger.herrmann@gmx.de>

org.eclipse.jgit.pgm.test/src/org/eclipse/jgit/pgm/CLIGitCommand.java

@@ -218,7 +218,7 @@ public class CLIGitCommand extends Main {
 					inquote = !inquote;
 				continue;
 			case '\\':
-				if (inquote || ip == commandLine.length())
+				if (inDblQuote || inquote || ip == commandLine.length())
 					r.append(b); // literal within a quote
 				else
 					r.append(commandLine.charAt(ip++));

org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/CLIGitCommandTest.java

@@ -51,9 +51,11 @@ public class CLIGitCommandTest {
 
 	@Test
 	public void testSplit() throws Exception {
+		assertArrayEquals(new String[0], split(""));
 		assertArrayEquals(new String[] { "a" }, split("a"));
 		assertArrayEquals(new String[] { "a", "b" }, split("a b"));
 		assertArrayEquals(new String[] { "a", "b c" }, split("a 'b c'"));
 		assertArrayEquals(new String[] { "a", "b c" }, split("a \"b c\""));
+		assertArrayEquals(new String[] { "a", "b\\c" }, split("a \"b\\c\""));
 	}
 }