patch 9.0.0754: 'indentexpr' overrules lisp indenting in one situation

Problem:    'indentexpr' overrules lisp indenting in one situation.
Solution:   Add "else" to keep the lisp indent. (issue #11327)

src/change.c

@@ -2269,19 +2269,18 @@ open_line(
     else
 	vreplace_mode = 0;
 
-    // May do lisp indenting.
     if (!p_paste
 	    && leader == NULL
 	    && curbuf->b_p_lisp
 	    && curbuf->b_p_ai)
     {
+	// do lisp indenting
 	fixthisline(get_lisp_indent);
 	ai_col = (colnr_T)getwhitecols_curline();
     }
-
-    // May do indenting after opening a new line.
-    if (do_cindent)
+    else if (do_cindent)
     {
+	// do 'cindent' or 'indentexpr' indenting
 	do_c_expr_indent();
 	ai_col = (colnr_T)getwhitecols_curline();
     }

src/testdir/test_lispindent.vim

@@ -91,6 +91,17 @@ func Test_lispindent_negative()
   call assert_equal(-1, lispindent(-1))
 endfunc
 
+func Test_lispindent_with_indentexpr()
+  enew
+  setl ai lisp nocin indentexpr=11
+  exe "normal a(x\<CR>1\<CR>2)\<Esc>"
+  let expected = ['(x', '  1', '  2)']
+  call assert_equal(expected, getline(1, 3))
+  normal 1G=G
+  call assert_equal(expected, getline(1, 3))
+  bwipe!
+endfunc
+
 func Test_lisp_indent_works()
   " This was reading beyond the end of the line
   new

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    754,
 /**/
     753,
 /**/