patch 8.2.1555: not all tests are executed on Github Actions

Problem:    Not all tests are executed on Github Actions.
Solution:   Copy "src" to "src2" earlier. Recognize "src2" in a couple more
            places.  Add two tests to the list of flaky tests. (Ken Takata,
            closes #6798)

.github/workflows/ci-windows.yaml

@@ -127,6 +127,11 @@ jobs:
         )
         goto :eof
 
+    - name: Copy src directory to src2
+      shell: cmd
+      run: |
+        xcopy src src2\ /E > nul
+
     - name: Build (MSVC)
       if: matrix.toolchain == 'msvc'
       shell: cmd
@@ -196,10 +201,6 @@ jobs:
         echo %COL_GREEN%vim version:%COL_RESET%
         .\vim --version || exit 1
 
-        mkdir ..\src2
-        xcopy testdir ..\src2\testdir\ /E > nul || exit 1
-        copy evalfunc.c ..\src2 > nul
-
         echo %COL_GREEN%Start testing vim in background.%COL_RESET%
         start cmd /c "cd ..\src2\testdir & nmake -nologo -f Make_dos.mak VIMPROG=..\..\src\vim > nul & echo done>done.txt"
 

src/testdir/runtest.vim

@@ -382,7 +382,9 @@ endif
 
 " Names of flaky tests.
 let s:flaky_tests = [
+      \ 'Test_BufWrite_lockmarks()',
       \ 'Test_autocmd_SafeState()',
+      \ 'Test_bufunload_all()',
       \ 'Test_client_server()',
       \ 'Test_close_and_exit_cb()',
       \ 'Test_close_output_buffer()',

src/testdir/test_python2.vim

@@ -2412,7 +2412,7 @@ func Test_python_chdir()
     cb.append(vim.eval('@%'))
     os.chdir('..')
     path = fnamemodify('.', ':p:h:t')
-    if path != 'src':
+    if path != 'src' and path != 'src2':
       # Running tests from a shadow directory, so move up another level
       # This will result in @% looking like shadow/testdir/Xfile, hence the
       # extra fnamemodify
@@ -2422,7 +2422,8 @@ func Test_python_chdir()
       os.chdir(path)
       del path
     else:
-      cb.append(fnamemodify('.', ':p:h:t'))
+      # Also accept running from src2/testdir/ for MS-Windows CI.
+      cb.append(fnamemodify('.', ':p:h:t').replace('src2', 'src'))
       cb.append(vim.eval('@%').replace(os.path.sep, '/'))
     os.chdir('testdir')
     cb.append(fnamemodify('.', ':p:h:t'))

src/testdir/test_python3.vim

@@ -2591,7 +2591,7 @@ func Test_python3_chdir()
     cb.append(vim.eval('@%'))
     os.chdir('..')
     path = fnamemodify('.', ':p:h:t')
-    if path != b'src':
+    if path != b'src' and path != b'src2':
       # Running tests from a shadow directory, so move up another level
       # This will result in @% looking like shadow/testdir/Xfile, hence the
       # slicing to remove the leading path and path separator
@@ -2600,7 +2600,8 @@ func Test_python3_chdir()
       cb.append(vim.eval('@%')[len(path)+1:].replace(os.path.sep, '/'))
       os.chdir(path)
     else:
-      cb.append(str(fnamemodify('.', ':p:h:t')))
+      # Also accept running from src2/testdir/ for MS-Windows CI.
+      cb.append(str(fnamemodify('.', ':p:h:t').replace(b'src2', b'src')))
       cb.append(vim.eval('@%').replace(os.path.sep, '/'))
     del path
     os.chdir('testdir')

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1555,
 /**/
     1554,
 /**/