Fix corner case in compute_modified_ranges

src/selection.cc

@@ -183,7 +183,7 @@ Vector<Selection> compute_modified_ranges(Buffer& buffer, size_t timestamp)
     }
 
     auto touches = [&](const Selection& lhs, const Selection& rhs) {
-        return buffer.char_next(lhs.max()) >= rhs.min();
+        return lhs.max() == end_coord or buffer.char_next(lhs.max()) >= rhs.min();
     };
     size_t dummy = 0;
     ranges.erase(merge_overlapping(ranges.begin(), ranges.end(), dummy, touches), ranges.end());

test/regression/0-undo-change-at-eof/cmd

@@ -0,0 +1 @@
+<a-l>yjxRu

test/regression/0-undo-change-at-eof/in

@@ -0,0 +1,2 @@
+copy
+paste

test/regression/0-undo-change-at-eof/out

@@ -0,0 +1,2 @@
+copy
+paste