https://bugzilla.wikimedia.org/show_bug.cgi?id=16700
Summary: Nesting templates lead to excess whitespace
Product: MediaWiki
Version: unspecified
Platform: All
URL: http://test.wikipedia.org/wiki/Line-
start_flag_lost_when_nesting_templates
OS/Version: All
Status: NEW
Keywords: parser, parsertest
Severity: normal
Priority: Normal
Component: Page rendering
AssignedTo: [email protected]
ReportedBy: [email protected]
Created an attachment (id=5594)
--> (https://bugzilla.wikimedia.org/attachment.cgi?id=5594)
Parser test showing the problem and the expected output
Some wikitext constructions depend on whether we are at the start of a line, or
not. This is tracked using a flag called lineStart. However, the parser
preprocessor loses track of this flag when a nested template is used.
See http://test.wikipedia.org/wiki/Line-start_flag_lost_when_nesting_templates
– it uses {{Top-level template}}, which is only a call to {{Subtemplate}}.
The parser thinks the list contained in {{Subtemplate}} is not at the line
start (even though it is, in fact), so that (according to bug 529 behavior) it
prepends a newline, which appears as a redundant paragraph on output.
If {{subtemplate}} is called directly, the paragraph disappears, and the output
is correct.
See the attached parser test.
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