Do not auto-insert separator for keepempty layouts

Candidate for stable

(cherry picked from commit 59d73f52b8)

src/Text3.cpp

@@ -1207,6 +1207,7 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 		pit_type prev = pit > 0 ? depthHook(pit, par.getDepth()) : pit;
 		if (prev < pit && cur.pos() == par.beginOfBody()
 		    && !par.size() && !par.isEnvSeparator(cur.pos())
+		    && !par.layout().keepempty
 		    && !par.layout().isCommand()
 		    && pars_[prev].layout() != par.layout()
 		    && pars_[prev].layout().isEnvironment()

status.23x

@@ -69,6 +69,8 @@ What's new
 
 - Fix parsing of math-macro optional arguments after save-reopen (bug 11346).
 
+- Fix problem with wrongly inserted separator.
+
 
 * USER INTERFACE