Add support for <a-;> in prompt mode

Fixes #2096
Closes #2060

doc/pages/keys.asciidoc

@@ -739,3 +739,6 @@ The following keys are recognized by this mode to help with editing (See <<comma
 *<a-!>*::
     expand the typed expansions in currently entered text
     (See <<expansions#typed-expansions,`:doc expansions typed-expansions`>>)
+
+*<a-;>*::
+    escape to normal mode for a single command

src/input_handler.cc

@@ -175,11 +175,14 @@ public:
                   context().client().check_if_buffer_needs_reloading();
               timer.set_next_date(Clock::now() + get_fs_check_timeout(context()));
           }}},
-          m_single_command(single_command)
+          m_state(single_command ? State::SingleCommand : State::Normal)
     {}
 
     void on_enabled() override
     {
+        if (m_state == State::PopOnEnabled)
+            return pop_mode();
+
         if (not (context().flags() & Context::Flags::Draft))
         {
             if (context().has_client())
@@ -214,6 +217,7 @@ public:
 
     void on_key(Key key) override
     {
+        kak_assert(m_state != State::PopOnEnabled);
         ScopedSetBool set_in_on_key{m_in_on_key};
 
         // Hack to parse keys sent by terminals using the 8th bit to mark the
@@ -283,11 +287,12 @@ public:
         }
         else
         {
-            // Preserve hooks disabled for the whole execution prior to pop_mode
+            auto pop_if_single_command = on_scope_end([this] {
-            ScopedSetBool disable_hooks{context().hooks_disabled(),
+                if (m_state == State::SingleCommand and enabled())
-                                        m_single_command and m_hooks_disabled};
-            if (m_single_command)
                      pop_mode(); 
+                else if (m_state == State::SingleCommand)
+                     m_state = State::PopOnEnabled;
+            });
 
             context().print_status({});
             if (context().has_client())
@@ -350,7 +355,9 @@ private:
     Timer m_idle_timer;
     Timer m_fs_check_timer;
     MouseHandler m_mouse_handler;
-    const bool m_single_command;
+
+    enum class State { Normal, SingleCommand, PopOnEnabled };
+    State m_state;
 };
 
 template<WordType word_type>
@@ -897,6 +904,11 @@ public:
                 return;
             }
         }
+        else if (key == alt(';'))
+        {
+            push_mode(new Normal(context().input_handler(), true));
+            return;
+        }
         else
         {
             m_line_editor.handle_key(key);
@@ -999,9 +1011,11 @@ private:
             m_idle_timer.set_next_date(Clock::now() + get_idle_timeout(context()));
     }
 
-    void on_disabled(bool) override
+    void on_disabled(bool temporary) override
     {
+        if (not temporary)
             context().print_status({});
+
         m_idle_timer.set_next_date(TimePoint::max());
         if (context().has_client())
             context().client().menu_hide();

test/regression/1435-misplaced-cursor-with-show_matching-hl/ui-out

@@ -2,7 +2,7 @@
 { "jsonrpc": "2.0", "method": "draw", "params": [[[{ "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": "·" }, { "face": { "fg": "black", "bg": "cyan", "attributes": [] }, "contents": "¬" }], [{ "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": "¬" }]], { "fg": "default", "bg": "default", "attributes": [] }, { "fg": "blue", "bg": "default", "attributes": [] }] }
 { "jsonrpc": "2.0", "method": "menu_hide", "params": [] }
 { "jsonrpc": "2.0", "method": "info_hide", "params": [] }
-{ "jsonrpc": "2.0", "method": "draw_status", "params": [[], [{ "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": "out 1:2 " }, { "face": { "fg": "black", "bg": "yellow", "attributes": [] }, "contents": "[+]" }, { "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": " " }, { "face": { "fg": "yellow", "bg": "default", "attributes": [] }, "contents": "insert" }, { "face": { "fg": "cyan", "bg": "default", "attributes": [] }, "contents": " " }, { "face": { "fg": "blue", "bg": "default", "attributes": [] }, "contents": "1 sels (1)" }, { "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": " - client0@[kak-tests]" }], { "fg": "cyan", "bg": "default", "attributes": [] }] }
+{ "jsonrpc": "2.0", "method": "draw_status", "params": [[], [{ "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": "out 1:2 " }, { "face": { "fg": "black", "bg": "yellow", "attributes": [] }, "contents": "[+]" }, { "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": " " }, { "face": { "fg": "blue", "bg": "default", "attributes": [] }, "contents": "1 sel" }, { "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": " - client0@[kak-tests]" }], { "fg": "cyan", "bg": "default", "attributes": [] }] }
 { "jsonrpc": "2.0", "method": "set_cursor", "params": ["buffer", { "line": 0, "column": 1 }] }
 { "jsonrpc": "2.0", "method": "refresh", "params": [true] }
 { "jsonrpc": "2.0", "method": "draw", "params": [[[{ "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": "·" }, { "face": { "fg": "black", "bg": "cyan", "attributes": [] }, "contents": "¬" }], [{ "face": { "fg": "default", "bg": "default", "attributes": [] }, "contents": "¬" }]], { "fg": "default", "bg": "default", "attributes": [] }, { "fg": "blue", "bg": "default", "attributes": [] }] }