URL: <https://savannah.gnu.org/bugs/?66749>
Summary: Misinterpretation of unicode LEFT-TO-RIGHT MARK
(200e) in screen 5
Group: GNU Screen
Submitter: mml
Submitted: Mon 03 Feb 2025 06:19:32 PM UTC
Category: User Interface
Severity: 3 - Normal
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Release: 5.0.0
Fixed Release: None
Planned Release: None
Work Required: None
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Follow-up Comments:
-------------------------------------------------------
Date: Mon 03 Feb 2025 06:19:32 PM UTC By: Matt Liggett <mml>
I admit I don't know exactly how LEFT-TO-RIGHT MARK should be interpreted. I
only know I have a program which emits it
(https://dianne.skoll.ca/projects/remind/) and that it works invisibly with
urxvt, xterm and tmux, and I believe it previously worked fine with screen 4,
but with screen 5 I observe this behavior (simplified test case)
% perl -e 'binmode STDOUT, ":utf8"; print "$_\x{200e}\n" for ("", "b", "ba",
"baz", "baz ")'
◆
b▒
ba␉
baz
In case there are encoding issues with the pasted text, here is hexdump output
of me using the X clipboard to cut/paste the issue into a file. If needed, I
can produce a screenshot.
% xxd -g1 baz.txt
00000000: 25 20 70 65 72 6c 20 2d 65 20 27 62 69 6e 6d 6f % perl -e 'binmo
00000010: 64 65 20 53 54 44 4f 55 54 2c 20 22 3a 75 74 66 de STDOUT, ":utf
00000020: 38 22 3b 20 70 72 69 6e 74 20 22 24 5f 5c 78 7b 8"; print "$_\x{
00000030: 32 30 30 65 7d 5c 6e 22 20 66 6f 72 20 28 22 22 200e}\n" for (""
00000040: 2c 20 22 62 22 2c 20 22 62 61 22 2c 20 22 62 61 , "b", "ba", "ba
00000050: 7a 22 2c 20 22 62 61 7a 22 29 27 0a 20 20 0a e2 z", "baz")'. ..
00000060: 97 86 0a 62 e2 96 92 0a 62 61 e2 90 89 0a 62 61 ...b....ba....ba
00000070: 7a 20 0a z .
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