https://bugzilla.wikimedia.org/show_bug.cgi?id=68297
Bug ID: 68297
Summary: VisualEditor: Investigate parsing/rendering/behavior
of "{{MW 1.23}}" on mediawiki.org
Product: VisualEditor
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: Unprioritized
Component: General
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Web browser: ---
Mobile Platform: ---
(This bug notes issues with both Parsoid and VisualEditor. I think all of this
is caused by the terrible mistake that is bug 529 / bug 12974. I'll leave it
for you to figure out this mess. :) )
----
On mediawiki.org, there is a family on fancy templates like [[mw:Template:MW
1.23]] that generate a right-floated MediaWiki version number in a frame.
These templates generate a wikitext table (starting with '{|'), which means
that due to bug 529 / bug 12974 a newline is prepended before it. This behavior
is incredibly annoying in practice, but it seems that we're very much wedded to
it because it made Parsoid people's lives easier.
----
However, Parsoid rendering of this particular template is inconsistent with
PHP. On [[mw:Manual:Skinning#Localisation_messages]], PHP generates an empty
paragraph before the table, while Parsoid doesn't and produces an about-grouped
pair of <span>\n</span><table>…</table> (the span tag only contains the
prepended newline).
This rendering, that looks good in Parsoid/VisualEditor, therefore looks like
crap in PHP parser.
Note that the <span> is not nested in a <p> or any other block-level element,
it just sits there right in the <body>. (It is not visible since, as I
mentioned, it just contains some whitespace.)
----
More problems appear when you try to edit text with this template in
VisualEditor.
For example, testing on [[mw:Manual:Skinning#Localisation_messages]]:
* Place cursor before/after one of the templates.
* Press 'Right'/'Left' keyboard key twice.
** First press selects the template, as expected.
** Second press scrolls the page all the way up.
* Try inserting the "MW 1.23" template on an empty line.
** Observe that the blue highlights are different than for the
templates already present on the page – there is both the table, as
well as a single "space" (?) in text flow. Observe that the context
menu is placed weirdly in the middle of the page.
** Place cursor after the "space" and try typing. Weird things happen,
sometimes I get an exception "Uncaught Error: Unbalanced set of
replace operations found", sometimes my input is duplicated or I
get snowmen and pawns.
** Try deleting the template in any way. It is deleted, but the page
is scrolled all the way up.
* Edit the two paragraphs right after the "Localisation messages"
heading (add a letter somewhere in the middle or something).
* Try saving the page.
** Observe that multiple newline-related changes appear to have been
made. Strangely, there are actually no changes, but the *before*
half of the comparison has some newlines removed.
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