Some templates (like succession boxes) unfortunately need to be on separate lines in the wikitext :( But the current UI for this is non-obvious and could be made better.
Version: unspecified
Severity: enhancement
Yeah, this is a bit of a mess. We could get Parsoid to /always/ do a newline between templates of the same generated block, I suppose? Gabriel, thoughts?
This is the exact wikitext that is interspersed between template calls, so follows our DOM spec (see http://www.mediawiki.org/wiki/Parsoid/MediaWiki_DOM_spec#Template_content).
The decision whether that should be presented in the UI is one for the VisualEditor team to make. Non-whitespace content like '|-' for a new table row is probably important to show, while pure ws could also be hidden from view.
The work-around that Parsoid did to hide these means that these don't appear unless it's mis-matched, which is reasonable enough that I'm going to flag as WORKSFORME.