Patch 8.2.4737
Problem:    // in JavaScript string recognized as comment.
Solution:   Only check for linecomment if 'cindent' is set. (closes #10151)
Files:      src/change.c, src/testdir/test_textformat.vim


*** ../vim-8.2.4736/src/change.c        2022-04-07 15:07:42.680524339 +0100
--- src/change.c        2022-04-11 17:33:33.620807957 +0100
***************
*** 1659,1665 ****
        lead_len = get_leader_len(saved_line, &lead_flags,
                                                        dir == BACKWARD, TRUE);
  #ifdef FEAT_CINDENT
!       if (lead_len == 0 && do_cindent && dir == FORWARD)
        {
            // Check for a line comment after code.
            comment_start = check_linecomment(saved_line);
--- 1659,1665 ----
        lead_len = get_leader_len(saved_line, &lead_flags,
                                                        dir == BACKWARD, TRUE);
  #ifdef FEAT_CINDENT
!       if (lead_len == 0 && curbuf->b_p_cin && do_cindent && dir == FORWARD)
        {
            // Check for a line comment after code.
            comment_start = check_linecomment(saved_line);
*** ../vim-8.2.4736/src/testdir/test_textformat.vim     2022-02-08 
12:58:32.416043337 +0000
--- src/testdir/test_textformat.vim     2022-04-11 17:33:05.148887174 +0100
***************
*** 278,289 ****
                        //
    END
    call assert_equal(expected, getline(1, '$'))
    normal 2GO
    let expected =<< trim END
        nop;
  
        val = val;      // This is a comment
-                       //
    END
    call assert_equal(expected, getline(1, '$'))
  
--- 278,302 ----
                        //
    END
    call assert_equal(expected, getline(1, '$'))
+ 
+   " using 'indentexpr' instead of 'cindent' does not repeat a comment
+   setl nocindent indentexpr=2
+   3delete
+   normal 2Gox
+   let expected =<< trim END
+       nop;
+       val = val;      // This is a comment
+         x
+   END
+   call assert_equal(expected, getline(1, '$'))
+   setl cindent indentexpr=
+   3delete
+ 
    normal 2GO
    let expected =<< trim END
        nop;
  
        val = val;      // This is a comment
    END
    call assert_equal(expected, getline(1, '$'))
  
*** ../vim-8.2.4736/src/version.c       2022-04-11 15:28:45.824940910 +0100
--- src/version.c       2022-04-11 17:35:02.760573025 +0100
***************
*** 748,749 ****
--- 748,751 ----
  {   /* Add new patch number below this line */
+ /**/
+     4737,
  /**/

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