| Dexxor | |
| Dec 14 2024, 10:00 AM |
| F58024092: Screenshot 2024-12-16 at 16.58.30.png | |
| Dec 16 2024, 4:04 PM |
Enable "MathML (experimental; no images)" or "Client side MathJax rendering" in Special:Preferences → Apperance → Math. Then preview a page with the contents <math>\overbrace x</math>.
I expect to see a curly brace above x like this:
⏞ x
but it's actually the other way around:
x ⏞
For a real-world example, see this figure.
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| Fix rendering of underOver | mediawiki/extensions/Math | REL1_43 | +27 -19 | |
| Fix rendering of underOver | mediawiki/extensions/Math | master | +27 -19 |
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | Feature | JeanCASPAR | T397585 Provide a macro for putting arbitrary Unicode content in <mo> tag | ||
| Open | Physikerwelt | T271001 Transition to MathML rendering as default | |||
| Open | None | T375318 Native MathML mode formatting bugs | |||
| In Progress | BUG REPORT | Physikerwelt | T375238 Client-side MathJax rendering problems | ||
| Resolved | BUG REPORT | Physikerwelt | T382196 \overbrace rendered below (not above) in MathML and client-side Mathjax |
The macros overarc, overline, overrightarrow, overleftarrow, overleftrightarrow are also affected by this bug.
The issue is that the PHP function underOver decides between above and below using $name[0] but $name is \overbrace with a backslash.
Thanks for reporting. That's an obvious bug. @Andreg-p and I recently changed the internal treatment of macros to include the \ in the macro names.
The respective code checks if the macro name has the letter 'o' at position 0. Now, this is position 1; thus, it does not work. We could now change it from 0 -> 1 to fix the problem. However, I would rather define an explicit list of which macros generate over and which generate under.
Change #1104157 had a related patch set uploaded (by Physikerwelt; author: Physikerwelt):
[mediawiki/extensions/Math@master] Fix rendering of underOver
Change #1104157 merged by jenkins-bot:
[mediawiki/extensions/Math@master] Fix rendering of underOver
Works now on beta; deployment to other wikis will happen Thursday. Unfortunately, affected pages need to be pruned with action=purge
Change #1105075 had a related patch set uploaded (by Krinkle; author: Physikerwelt):
[mediawiki/extensions/Math@REL1_43] Fix rendering of underOver
Change #1105075 merged by jenkins-bot:
[mediawiki/extensions/Math@REL1_43] Fix rendering of underOver