I just ran into the following PR: https://github.com/discourse/discourse/pull/15032 I think it my render legit Hebrew or Arabic text unreadable. One of the solutions I ran into was disabling the unicode algorithms and just display some representation of non-printable characters (I think it was im…

Demo: #include <stdio.h> int main() { /* Say hello; newline<U+2067> /*/ return 0 ; printf("Hello world.\n"); return 0; } #include int main() { /* Say hello; newline<U+2067> /*/ return 0 ; printf("Hello world.\n"); return 0; } Test: ‫"שלום חבר" - Hello Friend Without BI…

Thank you for raising this, we did think of this concern. The fix you linked in the OP only applies to unicode bidirectional characters in pre and code blocks, either manually written as HTML or generated from ``` markdown fenced code blocks, so it should not be an issue with regular Hebrew or Arabi…

I’ll give another example where no RLM does break the sentence. שלום לכולם ובמיוחד ל־Sam, Martin בחר לעזוב אותנו. שלום לכולם ובמיוחד ל־Sam,‏ Martin בחר לעזוב אותנו. Do you see the difference? The only change there is RLM, I wanted to congratulate Sam and inform that Martin is leaving (No offense…

Yes, that example is certainly much better! As you can see it continues to work and is not impacted by the security fix :tada:

Hmmm it’s not a codeblock :slight_smile: I meant that inside a codeblock it won’t appear as expected (This is what the fix is all about, am I right?)

[image] yaron: I meant that inside a codeblock it won’t appear as expected Yeah but why would you include it in a code block?

Excerpt from gettext, Hebrew/Arabic native strings, there are such cases.

[image] yaron: Excerpt from gettext, I would the outlier case here has workarounds (screenshot, attachment uploads and so on), also it is pretty clear that the special char is in place. The risk of https://trojansource.codes/ is higher than the risk of mild disruption in extreme outlier case…

But my suggestion breaks the sentence with some cue, so replacing the RLM and LRM with <RLM> or <LRM> will show the user that there were some additional characters and now the text is rendered without them yet informing that it might break the experience and that there’s an option to replace back ma…

Not following, we do not strip we replace , see my example above

I understand, wouldn’t it be better to use their names instead of Unicode entity?

Bidirectional characters in LTR languages post security fix

Product Support

sam (Sam Saffron) November 28, 2021, 9:05pm 17

If there is repeat confusion reported in the wild we can certainly fine tune

Topic		Replies	Views
Wrong -> arrow direction in RTL text contexts Feature rtl	12	722	May 26, 2025
Uncode Emoji incorrectly converted to text inside code blocks Bug markdown-it-review	1	1288	January 8, 2016
Markdown css styles not shown when RTL is enable Bug	9	2204	July 16, 2018
Right to left override messes up the text in reviews Bug review-queue	5	198	April 30, 2025
Links are Left-to-Right by default Bug	1	593	May 19, 2019

Bidirectional characters in LTR languages post security fix

Related topics