[Weechat-dev] [bug #40985] Unicode character "ZERO WIDTH SPACE" causes display corruption

[Christopher O'Neill]

URL:
  <http://savannah.nongnu.org/bugs/?40985>

                 Summary: Unicode character "ZERO WIDTH SPACE" causes display
corruption
                 Project: WeeChat
            Submitted by: deltafire
            Submitted on: Sun 22 Dec 2013 11:22:42 GMT
                Category: display
                Severity: 3 - Normal
              Item Group: display
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 0.4.3-dev
                IRC nick: Deltafire

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Details:

The unicode character "ZERO WIDTH SPACE" (utf-8 E2 80 8B) sometimes causes
characters to be missing from the prefix of the following line.

To reproduce:
1. Install the shell.py script.
2. Create the following python file 'test.py':
---
#!/usr/local/bin/python

for i in range(30):
    print "%02d 01\xe2\x80\x8b23456789" % i
---
3. Join an empty channel, run /shell test.py a couple of times.
4. Scroll up and down the buffer, switch to different buffers and back again.

Notes:
- ctrl-L fixes the display
- Switching to an empty buffer and back again causes no corruption
- Not all buffers cause corruption when switched to
- Sometimes characters from the previous buffer remain on screen
- Tested using iTerm2 and PuTTY
- Tested on FreeBSD 9.2 with Tmux 1.8






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