Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes #11858)

Problem:    Code in same_leader() can be simplified.
Solution:   Simplify code that is executed only once. (closes #11867)

Problem:    MS-Windows console: not flushing termguicolors.
Solution:   Flush termguicolors. (Christopher Plewright, closes #11871)

Problem:    The code style has to be checked manually.
Solution:   Add basic code style checks in a test.  Fix or avoid uncovered
            problems.

Problem:    search() loops forever if "skip" is TRUE for all matches.
Solution:   Keep the position of the first match.

Problem:    ColorTable saving and restoring does not work properly.
Solution:   Restore ColorTable[16] usage. (Christopher Plewright,
            closes #11836)

Problem:    Completion of :runtime does not handle {where} argument.
Solution:   Parse the {where} argument. (closes #11863)

Problem:    Apache thrift files are not recognized.
Solution:   Add a pattern for thrift files. (Amaan Qureshi, closes #11859)

Problem:    Cap'n Proto files are not recognized.
Solution:   Add a pattern and the "capnp" filetype. (Amaan Qureshi,
            closes #11862)

Problem:    Fuzzy menu completion is only tested in the GUI.
Solution:   Make fuzzy menu completion test work without GUI.
            (closes #11861)