Enable change tracking if paragraph break change

When a selection spans more than one line, we now check for whether
there is a change at one position after the last position of each
fully selected line.

This fixes #11629.

(cherry picked from commit 27f89144bb)

src/Text3.cpp

@@ -3216,7 +3216,9 @@ bool Text::getStatus(Cursor & cur, FuncRequest const & cmd,
 				if (in_last_par)
 					end = cur.selectionEnd().pos();
 				else
-					end = it.lastpos();
+					// the +1 is needed for cases, e.g., where there is a
+					// paragraph break. See #11629.
+					end = it.lastpos() + 1;
 				if (beg != end && it.paragraph().isChanged(beg, end)) {
 					enable = true;
 					break;

status.23x

@@ -131,6 +131,8 @@ What's new
 
 - Show filenames for verbatim includes in outliner (bug 11612).
 
+- Enable change tracking if paragraph break change (bug 11629).
+
 
 * INTERNALS