Problem:    It is not possible to manipulate autocommands.
Solution:   Add functions to add, get and set autocommands. (Yegappan
            Lakshmanan, closes #10291)

Problem:    When 'shortmess' contains 'A' loading a session may still warn for
            an existing swap file. (Melker Österberg)
Solution:   Keep the 'A' flag to 'shortmess' in the session file.
            (closes #10443)

Problem:    Accessing freed memory when line is flushed.
Solution:   Make a copy of the pattern to search for.

Problem:    No error if engine selection atom is not at the start.
Solution:   Give an error. (Christian Brabandt, closes #10439)

Problem:    Memory access error when substitute expression changes window.
Solution:   Disallow changing window in substitute expression.

Problem:    Coverity complains about not restoring a saved value.
Solution:   Restore value before handling error.

Problem:    Recursive command line loop may cause a crash.
Solution:   Limit recursion of getcmdline().

Problem:    ":so" command may read after end of buffer.
Solution:   Compute length of text properly.

Problem:    Vim9: type error for list unpack mentions argument.
Solution:   Mention variable. (close #10435)

Problem:    Vim9: compilation fails when using dict member when skipping.
Solution:   Do not generate ISN_USEDICT when skipping. (closes #10433)