Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes #11792)

Problem:    Invalid memory access with bad 'statusline' value.
Solution:   Avoid going over the NUL at the end.

Problem:    Code is indented more than needed.
Solution:   Use an early return to reduce indentation. (Yegappan Lakshmanan,
            closes #11769)

Problem:    Cannot display 'showcmd' somewhere else.
Solution:   Add the 'showcmdloc' option. (Luuk van Baal, closes #11684)

Problem:    Using one window for executing autocommands is insufficient.
Solution:   Use up to five windows for executing autocommands.

Problem:    Crash when unletting a variable while listing variables.
Solution:   Disallow changing a hashtable while going over the entries.
            (closes #11435)

Problem:    Handling 'statusline' errors is spread out.
Solution:   Pass the option name to the lower levels so the option can be
            reset there when an error is encountered. (Luuk van Baal,
            closes #11467)

Problem:    Dummy buffer ends up in a window.
Solution:   Disallow navigating to a dummy buffer.

Problem:    Cannot use 'indentexpr' for Lisp indenting.
Solution:   Add the 'lispoptions' option.