Fix #40: Spurious undo in live interactive mode

Problem identified and patch provided by @wilywampa

autoload/easy_align.vim

@@ -640,7 +640,8 @@ function! s:interactive(range, modes, n, d, opts, rules, vis, live, bvis)
       let output = s:process(a:range, mode, n, d, s:normalize_options(opts), regx, a:rules, a:bvis)
       let &undolevels = &undolevels " Break undo block
       call s:update_lines(output.todo)
-      let undo = 1
+      let undo = !empty(output.todo)
+      let undo = !empty(output.todo)
       let rdrw = 1
     endif
     if rdrw

test/fixed.vader

@@ -161,4 +161,17 @@ Expect:
 
   d, e, f
 
+Given c (#40 Ignored delimiters in LiveEasyAlign causes spurious undo):
+  printf("foo = %f\n", foo);
+  printf("foobar = %f\n", foobar);
+
+Do:
+  gUiw
+  :%LiveEasyAlign\<enter>
+  =\<bs>==
+
+Expect c:
+  PRINTF("foo = %f\n", foo);
+  printf("foobar = %f\n", foobar);
+
 Include: include/teardown.vader

test/include/teardown.vader

@@ -1,3 +1,4 @@
-Execute:
+Given:
+Execute (Restoring test environment):
   Restore