Problem: Lines to/from which virt_lines or inline virt_text may have
moved are left valid. Similarly the modified region may be
too small to account for moved decorations after inserting
or deleting lines. `redrawOneLine()` can be replaced with
a call to `changed_lines_redraw_buf()`.
Solution: Invalidate the line after a change if there is virt_lines, or
inline virt_text in the buffer with 'wrap' enabled. Extend the
modified region for inserted or deleted lines if there may be
decorations in the buffer. Remove `redrawOneLine()`.
Simplify the logic for `changed_lines_invalidate_win()`.
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
064ff74cdb