Update inserted range when generating InsertCompletionHide hook param

The buffer might have been mutated in the mean time.

Fixes #3270

src/changes.hh

@@ -81,7 +81,7 @@ void update_backward(ConstArrayView<Buffer::Change> changes, RangeContainer& ran
 }
 
 template<typename RangeContainer>
-void update_ranges(Buffer& buffer, size_t& timestamp, RangeContainer& ranges)
+void update_ranges(Buffer& buffer, size_t& timestamp, RangeContainer&& ranges)
 {
     if (timestamp == buffer.timestamp())
         return;

src/insert_completer.cc

@@ -464,6 +464,9 @@ void InsertCompleter::update(bool allow_implicit)
         setup_ifn();
 }
 
+auto& get_first(InsertCompletion& completions) { return completions.begin; }
+auto& get_last(InsertCompletion& completions) { return completions.end; }
+
 void InsertCompleter::reset()
 {
     if (m_explicit_completer or m_completions.is_valid())
@@ -472,6 +475,8 @@ void InsertCompleter::reset()
         if (m_context.has_client() and m_current_candidate >= 0 and m_current_candidate < m_completions.candidates.size() - 1)
         {
             auto& buffer = m_context.buffer();
+            update_ranges(buffer, m_completions.timestamp,
+                          ArrayView<InsertCompletion>(m_completions));
             auto ref = buffer.string(m_completions.begin, m_completions.end);
             const auto& cursor_pos = m_context.selections().main().cursor();
             const auto prefix_len = buffer.distance(m_completions.begin, cursor_pos);

test/regression/3270-crash-in-autocomplete/cmd

@@ -0,0 +1 @@
+cvery<c-x><c-w><c-n>()<c-o>

test/regression/3270-crash-in-autocomplete/in

@@ -0,0 +1 @@
+test(bool very_long_variable_name) : very_long_variable_name(%(replace))

test/regression/3270-crash-in-autocomplete/out

@@ -0,0 +1,2 @@
+test(bool very_long_variable_name) :
+very_long_variable_name(very_long_variable_name())

test/regression/3270-crash-in-autocomplete/rc

@@ -0,0 +1,2 @@
+source "%val{runtime}/rc/tools/autowrap.kak"
+autowrap-enable