patch 9.1.0269: Test for TextChanged is still flaky with ASAN

Problem:  Test for TextChanged is still flaky with ASAN.
Solution: Don't index the result of readfile().
          (zeertzjq)

It turns out that with ASAN the file may become empty during a write
even if it's non-empty both before and after the write, in which case
indexing the result of readfile() will error, so use join() instead.

Also don't delete the file halfway the test, just in case it may cause
errors on the next read.

closes: #14421

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_autocmd.vim

@@ -4495,39 +4495,40 @@ func Test_Changed_ChangedI()
         \ {'term_rows': 10})
   call assert_equal('running', term_getstatus(buf))
   call WaitForAssert({-> assert_true(filereadable('XTextChangedI3'))})
+  defer delete('XTextChangedI3')
   call WaitForAssert({-> assert_equal([''], readfile('XTextChangedI3'))})
 
   " TextChanged should trigger if a mapping enters and leaves Insert mode.
   call term_sendkeys(buf, "\<CR>")
-  call WaitForAssert({-> assert_equal('N4,', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N4,', readfile('XTextChangedI3')->join("\n"))})
 
   call term_sendkeys(buf, "i")
   call WaitForAssert({-> assert_match('^-- INSERT --', term_getline(buf, 10))})
-  call WaitForAssert({-> assert_equal('N4,', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N4,', readfile('XTextChangedI3')->join("\n"))})
   " TextChangedI should trigger if change is done in Insert mode.
   call term_sendkeys(buf, "f")
-  call WaitForAssert({-> assert_equal('N4,I5', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N4,I5', readfile('XTextChangedI3')->join("\n"))})
   call term_sendkeys(buf, "o")
-  call WaitForAssert({-> assert_equal('N4,I6', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N4,I6', readfile('XTextChangedI3')->join("\n"))})
   call term_sendkeys(buf, "o")
-  call WaitForAssert({-> assert_equal('N4,I7', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N4,I7', readfile('XTextChangedI3')->join("\n"))})
   " TextChanged shouldn't trigger when leaving Insert mode and TextChangedI
   " has been triggered.
   call term_sendkeys(buf, "\<Esc>")
   call WaitForAssert({-> assert_notmatch('^-- INSERT --', term_getline(buf, 10))})
-  call WaitForAssert({-> assert_equal('N4,I7', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N4,I7', readfile('XTextChangedI3')->join("\n"))})
 
   " TextChanged should trigger if change is done in Normal mode.
   call term_sendkeys(buf, "yyp")
-  call WaitForAssert({-> assert_equal('N8,I7', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N8,I7', readfile('XTextChangedI3')->join("\n"))})
 
   " TextChangedI shouldn't trigger if change isn't done in Insert mode.
   call term_sendkeys(buf, "i")
   call WaitForAssert({-> assert_match('^-- INSERT --', term_getline(buf, 10))})
-  call WaitForAssert({-> assert_equal('N8,I7', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N8,I7', readfile('XTextChangedI3')->join("\n"))})
   call term_sendkeys(buf, "\<Esc>")
   call WaitForAssert({-> assert_notmatch('^-- INSERT --', term_getline(buf, 10))})
-  call WaitForAssert({-> assert_equal('N8,I7', readfile('XTextChangedI3')[0])})
+  call WaitForAssert({-> assert_equal('N8,I7', readfile('XTextChangedI3')->join("\n"))})
 
   " TextChangedI should trigger if change is a mix of Normal and Insert modes.
   func! s:validate_mixed_textchangedi(buf, keys)
@@ -4537,13 +4538,13 @@ func Test_Changed_ChangedI()
     call term_sendkeys(buf, "\<Esc>")
     call WaitForAssert({-> assert_notmatch('^-- INSERT --', term_getline(buf, 10))})
     call term_sendkeys(buf, ":let [g:autocmd_n, g:autocmd_i] = ['', '']\<CR>")
-    call delete('XTextChangedI3')
+    call writefile([], 'XTextChangedI3')
     call term_sendkeys(buf, a:keys)
     call WaitForAssert({-> assert_match('^-- INSERT --', term_getline(buf, 10))})
-    call WaitForAssert({-> assert_match('^,I\d\+', readfile('XTextChangedI3')[0])})
+    call WaitForAssert({-> assert_match('^,I\d\+', readfile('XTextChangedI3')->join("\n"))})
     call term_sendkeys(buf, "\<Esc>")
     call WaitForAssert({-> assert_notmatch('^-- INSERT --', term_getline(buf, 10))})
-    call WaitForAssert({-> assert_match('^,I\d\+', readfile('XTextChangedI3')[0])})
+    call WaitForAssert({-> assert_match('^,I\d\+', readfile('XTextChangedI3')->join("\n"))})
   endfunc
 
   call s:validate_mixed_textchangedi(buf, "o")
@@ -4556,7 +4557,6 @@ func Test_Changed_ChangedI()
 
   " clean up
   bwipe!
-  call delete('XTextChangedI3')
 endfunc
 
 " Test that filetype detection still works when SwapExists autocommand sets

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    269,
 /**/
     268,
 /**/