Problem:    Using memory freed by losing the clipboard selection. (Dominique
            Pellé)
Solution:   Check y_array is still valid after calling changed_lines().
            (closes #9253)

Problem:    Vim9: Internal error when invoking closure in legacy context.
Solution:   Give a more appropriate error message. (closes #9251)

Problem:    MS-Windows: test sometimes runs into existing swap file.
Solution:   Use a different file name.

Problem:    Compiler warns for unused variable without the +textprop feature.
            (John Marriott)
Solution:   Adjust #ifdefs.

Problem:    Vim9: error for constant list size is only given at runtime.
Solution:   Give the error at compile time if possible.

Problem:    Vim9: range without a command is not compiled.
Solution:   Add the ISN_EXECRANGE byte code.

Problem:    Vim9: valgrind reports spurious problems for a test.
Solution:   Move the test to the set that is known to fail.

Problem:    Some unused assignments and ugly code in xxd.
Solution:   Leave out assignments.  Use marcro for fprintf(). (closes #9246)

Problem:    MS-Windows: No error message if vimgrep pattern is not matching.
Solution:   Give an error message. (Christian Brabandt, closes #9245,
            closes #8762)

Problem:    Cannot use Vim9 lambda for 'tagfunc'.
Solution:   Make it work, add more tests. (Yegappan Lakshmanan, closes #9250)