Explicitely call try_accept on InsertCompleter

Calling it as part of the insert method was error prone and often
led to slightly surprising behaviour, such as the <c-r><esc> hiding
the menu on <esc>.

src/input_handler.cc

@@ -1303,15 +1303,19 @@ class Insert : public InputMode
             selections.sort_and_merge_overlapping();
         }
         else if (auto cp = key.codepoint())
+        {
+            m_completer.try_accept();
             insert(*cp);
+        }
         else if (key == ctrl('r'))
         {
+            m_completer.try_accept();
             on_next_key_with_autoinfo(context(), "register", KeymapMode::None,
                 [this](Key key, Context&) {
                     auto cp = key.codepoint();
                     if (not cp or key == Key::Escape)
                         return;
-                    insert([&] { return RegisterManager::instance()[*cp].get(context()); });
+                    insert(RegisterManager::instance()[*cp].get(context()));
                 }, "enter register name", register_doc.str());
             update_completions = false;
         }
@@ -1359,6 +1363,7 @@ class Insert : public InputMode
         }
         else if (key == ctrl('v'))
         {
+            m_completer.try_accept();
             on_next_key_with_autoinfo(context(), "raw-insert", KeymapMode::None,
                 [this, transient](Key key, Context&) {
                     if (auto cp = get_raw_codepoint(key))
@@ -1387,6 +1392,7 @@ class Insert : public InputMode
 
     void paste(StringView content) override
     {
+        m_completer.try_accept();
         insert(ConstArrayView<StringView>{content});
         m_idle_timer.set_next_date(Clock::now() + get_idle_timeout(context()));
     }
@@ -1424,20 +1430,13 @@ class Insert : public InputMode
     template<typename S>
     void insert(ConstArrayView<S> strings)
     {
-        m_completer.try_accept();
+        kak_assert(not m_completer.has_candidate_selected());
         context().selections().for_each([strings, &buffer=context().buffer()]
                                         (size_t index, Selection& sel) {
             Kakoune::insert(buffer, sel, sel.cursor(), strings[std::min(strings.size()-1, index)]);
         }, false);
     }
 
-    template<std::invocable Func>
-    void insert(Func&& lazy_strings)
-    {
-        m_completer.try_accept();
-        insert(std::forward<Func>(lazy_strings)());
-    }
-
     void insert(Codepoint key)
     {
         String str{key};

src/insert_completer.cc

@@ -481,12 +481,12 @@ auto& get_last(BufferRange& range) { return range.end; }
 
 bool InsertCompleter::has_candidate_selected() const
 {
-    return m_current_candidate >= 0 and m_current_candidate < m_completions.candidates.size() - 1;
+    return m_completions.is_valid() and m_current_candidate >= 0 and m_current_candidate < m_completions.candidates.size() - 1;
 }
 
 void InsertCompleter::try_accept()
 {
-    if (m_completions.is_valid() and has_candidate_selected())
+    if (has_candidate_selected())
         reset();
 }
 

src/insert_completer.hh

@@ -90,6 +90,8 @@ public:
     void explicit_line_buffer_complete();
     void explicit_line_all_complete();
 
+    bool has_candidate_selected() const;
+
 private:
     bool setup_ifn();
 
@@ -98,7 +100,6 @@ private:
     void on_option_changed(const Option& opt) override;
 
     void menu_show();
-    bool has_candidate_selected() const;
 
     Context&            m_context;
     OptionManager&      m_options;