Problem:    Metafun files are not recogized.
Solution:   Add filetype detection patterns.

Problem:    Cursor displayed in wrong position after removing text prop. (Ben
            Jackson)
Solution:   Invalidate the cursor position. (closes #10898)

Problem:    Search and match highlgith interfere with virtual text highlight.
            (Ben Jackson)
Solution:   Check for match highlight after text properties.  Reset and
            restore search highlight when showing virtual text.
            (closes #10892)

Problem:    Possible invalid memory access when 'cmdheight' is zero. (Martin
            Tournoij)
Solution:   Avoid going over the end of w_lines[] when w_height is Rows.
            (closes #10882)

Problem:    Messages test fails; window size incorrect when 'cmdheight' is
            made smaller.
Solution:   Properly cleanup after test with cmdheight zero.  Resize windows
            correctly when 'cmdheight' gets smaller.

Problem:    The way 'cmdheight' can be made zero is inconsistent.
Solution:   Only make 'cmdheight' zero when setting it explicitly, not when
            resizing windows. (closes #10890)

Problem:    Invalid memory access for text prop without highlight.
Solution:   Check for a valid highlight ID.

Problem:    Strange effects when using virtual text with "text_align" and
            non-zero column. (Martin Tournoij)
Solution:   Give an error. (closes #10888)

Problem:    Command line height changes when maximizing window height.
Solution:   Do not change the command line height. (closes #10885)

Problem:    Virtual text without highlighting does not show. (Ben Jackson)
Solution:   Use a text property when it has highlighting or when it has text.
            (closes #10878)