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Created attachment 13635 [details]
Screenshot before/after insertion.

* Edit a page with a list of 3 inline templates as the first few nodes, for example:

<<<WT
* {{test|a}}.
* {{Unsigned|Root|00:43, 21 May 2013 (UTC)}}
* {{Unsigned|1=Root|2=00:43, 21 May 2013 (UTC)}}
* {{Unsigned|user=Root|date=00:43, 21 May 2013 (UTC)}}
* {{ {{ucfirst:{{lc:UNSIGNED}}}} |user=Root|date=00:43, 21 May 2013 (UTC)}}

{{FooStart|a|one}}
Hi middle;
{{FooEnd}}

{{FooStart|b}}
Hi (again), middle;
{{FooEnd}}

* {{PAGENAME}}

{{#tag:pre|{{msgnw::{{FULLPAGENAME}}}}}}

WT;

* While still in the slug on top, insert a transclusion (e.g. {{Unsigned|Foo}})
* After clicking "Apply changes" on the insertion dialog, the surface now has a selection spanning from {{Unsigned|Foo}} to right before {{FooStart}}. See attachment.