patch 9.0.1426: indent wrong after "export namespace" in C++

Problem:    Indent wrong after "export namespace" in C++.
Solution:   Skip over "inline" and "export" in any order. (Virginia Senioria,
            closes #12134, closes #12133)

src/cindent.c

@@ -769,7 +769,9 @@ cin_is_cpp_namespace(char_u *s)
 
     s = cin_skipcomment(s);
 
-    if (STRNCMP(s, "inline", 6) == 0 && (s[6] == NUL || !vim_iswordc(s[6])))
+    // skip over "inline" and "export" in any order
+    while ((STRNCMP(s, "inline", 6) == 0 || STRNCMP(s, "export", 6) == 0)
+					&& (s[6] == NUL || !vim_iswordc(s[6])))
 	s = cin_skipcomment(skipwhite(s + 6));
 
     if (STRNCMP(s, "namespace", 9) == 0 && (s[9] == NUL || !vim_iswordc(s[9])))

src/testdir/test_cindent.vim

@@ -4406,6 +4406,18 @@ def Test_cindent_47()
   inline/* test */namespace {
     111111111111111111;
   }
+  export namespace {
+    111111111111111111;
+  }
+  export inline namespace {
+    111111111111111111;
+  }
+  export/* test */inline namespace {
+    111111111111111111;
+  }
+  inline export namespace {
+    111111111111111111;
+  }
 
   /* invalid namespaces use block indent */
   namespace test test2 {
@@ -4509,6 +4521,18 @@ def Test_cindent_47()
   inline/* test */namespace {
   111111111111111111;
   }
+  export namespace {
+  111111111111111111;
+  }
+  export inline namespace {
+  111111111111111111;
+  }
+  export/* test */inline namespace {
+  111111111111111111;
+  }
+  inline export namespace {
+  111111111111111111;
+  }
 
   /* invalid namespaces use block indent */
   namespace test test2 {

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1426,
 /**/
     1425,
 /**/