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-rw-r--r--src/selection.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/selection.cc b/src/selection.cc
index d55b3d20..0ea173ce 100644
--- a/src/selection.cc
+++ b/src/selection.cc
@@ -122,6 +122,8 @@ Vector<Selection> compute_modified_ranges(Buffer& buffer, size_t timestamp)
auto forward_end = forward_sorted_until(change_it, changes.end());
auto backward_end = backward_sorted_until(change_it, changes.end());
+ kak_assert(std::is_sorted(ranges.begin(), ranges.end(), compare_selections));
+
size_t prev_size;
size_t dummy = 0;
if (forward_end >= backward_end)