bug#60189: [PATCH] ert-x: Refactor `ert-with-test-buffer-selected'

[Richard Hansen]

I think the attached patches can go on emacs-29 because 
`ert-with-test-buffer-selected' was added in 29.

Patch 1:

    ; ert-x: Add test for buffer read-only state

    This test should have been included with commit
    29b7d740006fe2190a729bd1c30ccab9356cee36.

Patch 2:

    ; ert-x: Simplify `ert-with-test-buffer-selected'

Patch 3:

    ert-x: Move window selection logic to its own macro

    * lisp/emacs-lisp/ert-x.el (ert-with-buffer-selected): New macro to
    temporarily display a buffer in a selected window and evaluate a body.
    (ert-with-test-buffer-selected): Use the new macro.
    * test/lisp/whitespace-tests.el (ert-test-with-buffer-selected/*): Add
    tests.

0001-ert-x-Add-test-for-buffer-read-only-state.patch
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0002-ert-x-Simplify-ert-with-test-buffer-selected.patch
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0003-ert-x-Move-window-selection-logic-to-its-own-macro.patch
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