[konsole] [Bug 450219] New: Trailing RLM characters are not displayed.

[Dotan Cohen]

https://bugs.kde.org/show_bug.cgi?id=450219

            Bug ID: 450219
           Summary: Trailing RLM characters are not displayed.
           Product: konsole
           Version: 21.03.80
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: font
          Assignee: konsole-devel at kde.org
          Reporter: kde-2011.08 at dotancohen.com
  Target Milestone: ---

BACKGROUND:
The RLM character is a non-printing character that has RTL (Right-to-Left)
directionality:
https://www.fileformat.info/info/unicode/char/200f/index.htm

ׁHere is the Hebrew word for peace, with a period AFTER the word. The period
SHOULD be on the left side of the word, but because bugs.kde.org is a LTR
(Left-to-Right) website it will erroneously appear on the right of the word:
שלום.

To resolve that, one places an RLM character AFTER the period:
שלום.‏

You can't see that RLM character after the period, but because it's there the
period is properly shown to the left of the word.

STEPS TO REPRODUCE
1. Print text to Konsole with a trailing RLM character
2. 
3. 

OBSERVED RESULT
RLM character is NOT displayed. It is a non-printing character so it cannot be
seen, but it's absence is noted by the period being on the right of the word.

EXPECTED RESULT
RLM character should displayed. It's presence would be noted by the period
being on the left of the word.

SOFTWARE/OS VERSIONS
KDE Frameworks 5.68.0
Qt 5.12.8 (built against 5.12.8)

ADDITIONAL INFORMATION
Here we can see that the RLM character at the end is not affecting the display
of the text. The period should be on the left. Echo is echoing two Hebrew
characters, then a period, then the letter e. Then sed is replacing the e with
the RLM:
$ echo "אב.e" | sed "s;e;$(echo -ne '\u200f');"
אב.

We can verify that the RLM is there with hd:
$ echo "אב.e" | sed "s;e;$(echo -ne '\u200f');" | hd
00000000  d7 90 d7 91 2e e2 80 8f  0a                       |.........|
00000009

The "e2 80 8f" bytes are the RLM, see the page linked above, which contains
this text:
UTF-8 (hex):    0xE2 0x80 0x8F (e2808f)

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