util, utf8: make ellipsize take multi-byte characters into account

rename old versions to ascii_*

Do not take into account zerowidth characters, but do consider double-wide characters.
Import needed utf8 helper code from glib.

v3: rebase ontop of utf8 restructuring work

[zj: tweak the algorithm a bit, move new code to separate file]

1 files changed, 0 insertions, 4 deletions

diff --git a/TODO b/TODO
index 4a498b9099..955241a90c 100644
--- a/TODO
+++ b/TODO
@@ -17,10 +17,6 @@ Bugfixes:
 
 * properly handle .mount unit state tracking when two mount points are stacked one on top of another on the exact same mount point.
 
-* ellipsize_mem must take into account multi-byte unicode characters, and
-  - make the resulting line the requested number of *characters*, not *bytes*,
-  - avoid truncuating multi-byte sequences in the middle.
-
 * When we detect invalid UTF-8, we cant't use it in an error message:
   log...("Path is not UTF-8 clean, ignoring assignment: %s", rvalue);