Problem: "pattern not found" for :global is not an error message.
Solution: In Vim9 script make this an actual error, so that try/catch can be
used as expected.
Problem: Various inconsistencies in test files.
Solution: Add modelines where they were missing. Use Check commands instead
of silently skipping over tests. Adjust indents and comments.
(Ken Takata, closes#6695)
Problem: assert_fails() checks the last error message.
Solution: Check the first error, it is more relevant. Fix all the tests
that rely on the old behavior.
Problem: When using :global clipboard isn't set correctly.
Solution: Set "clip_unnamed_saved" instead of "clip_unnamed". (Christian
Brabandt, closes#6203, closes#6198)
Problem: Code for modeless selection not sufficiently tested.
Solution: Add tests. Move mouse code functionality to a common script file.
(Yegappan Lakshmanan, closes#5821)
Problem: The :global command does not work recursively, which makes it
difficult to execute a command on a line where one pattern matches
and another does not match. (Miles Cranmer)
Solution: Allow for recursion if it is for only one line. (closes#1760)
Problem: MS-Windows: when 'clipboard' is "unnamed" yyp does not work in a
:global command.
Solution: When setting the clipboard was postponed, do not clear the
register.
