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)

Problem:    No cmdline completion for :runtime.
Solution:   Add completion for :runtime. (closes #11853, closes #11447)
            Improve the resulting matches.

Problem:    Spurious empty line when using text propertie and virtual text.
Solution:   Do not set "text_prop_follows" when the other text property is not
            virtual text. (closes #11846)

Problem:    Cannot call a :def function with a number for a float argument.
Solution:   Accept a number as well, convert it to a float.

Problem:    Cannot use setcellwidths() below 0x100.
Solution:   Also accept characters between 0x80 and 0x100. (Ken Takata,
            closes #11834)

Problem:    Terminal tests are flaky on MacOS.
Solution:   Add TermWait() calls. (Yegappan Lakshmanan, closes #11852)

Problem:    Completion includes functions that don't work.
Solution:   Skip functions that are not implemented. (Kota Kato,
            closes #11845)