Problem:    Location list window may open a wrong file.
Solution:   Also update the qf_ptr field. (Wei-Chung Wen, closes #8565,
            closes #8566)

Problem:    Not enough tests for quickfix end_col and end_lnum.
Solution:   Add a few more test cases. (Shane-XB-Qian, closes #8409)

Problem:    Location list only has the start position.
Solution:   Make it possible to add an end position. (Shane-XB-Qian,
            closes #8393)

Problem:    Formatting using quickfixtextfunc is lost when updating location
            lists for different buffers.  (Yorick Peterse)
Solution:   Use the right window for the locaiton list. (Yegappan Lakshmanan,
            closes #8400, closes #8403)

Problem:    Vim9: :cexpr does not work with local variables.
Solution:   Compile :cexpr.

Problem:    Cannot grep using fuzzy matching.
Solution:   Add the "f" flag to :vimgrep. (Yegappan Lakshmanan, closes #8152)

Problem:    Test may leave file behind.
Solution:   Delete the temporary file.  Don't profile in the running Vim
            instance.

Problem:    Vim9: cannot use Vim9 script syntax in some places.
Solution:   Add the :vim9cmd command modifier. Incompatible: Makes ":vim9"
            mean ":vim9cmd" instead of ":vim9script".

Problem:    :vimgrep expands wildcards twice.
Solution:   Do not expand wildcards a second time.

Problem:    Too many problems with using all autocommand events.
Solution:   Disallow defining an autocommand for all events.