ConPTY: Inject W32IM sequences (#17757)

Does what it says on the tin.

Part of #17737

## Validation Steps Performed
* In WSL run
  `printf "\e[?9001h"; sleep 1; printf "\e[?9001l"; read`
* Wait 1s and press Enter
* Run `showkey -a`
* Esc works ✅

src/host/_stream.cpp

@@ -371,9 +371,10 @@ void WriteCharsVT(SCREEN_INFORMATION& screenInfo, const std::wstring_view& str)
             write(offset, injection.offset);
             offset = injection.offset;
 
-            static constexpr std::array<std::string_view, 2> mapping{ {
+            static constexpr std::array<std::string_view, 3> mapping{ {
                 { "\x1b[?1004h\x1b[?9001h" }, // RIS: Focus Event Mode + Win32 Input Mode
-                { "\x1b[?1004h" } // DECSET_FOCUS: Focus Event Mode
+                { "\x1b[?1004h" }, // DECSET_FOCUS: Focus Event Mode
+                { "\x1b[?9001h" }, // Win32 Input Mode
             } };
             static_assert(static_cast<size_t>(InjectionType::Count) == mapping.size(), "you need to update the mapping array");
 

src/terminal/adapter/adaptDispatch.cpp

@@ -1999,7 +1999,10 @@ bool AdaptDispatch::_ModeParamsHelper(const DispatchTypes::ModeParams param, con
     case DispatchTypes::ModeParams::FOCUS_EVENT_MODE:
         _terminalInput.SetInputMode(TerminalInput::Mode::FocusEvent, enable);
         // ConPTY always wants to know about focus events, so let it know that it needs to re-enable this mode.
-        _api.GetStateMachine().InjectSequence(InjectionType::DECSET_FOCUS);
+        if (!enable)
+        {
+            _api.GetStateMachine().InjectSequence(InjectionType::DECSET_FOCUS);
+        }
         return true;
     case DispatchTypes::ModeParams::ALTERNATE_SCROLL:
         _terminalInput.SetInputMode(TerminalInput::Mode::AlternateScroll, enable);
@@ -2020,6 +2023,10 @@ bool AdaptDispatch::_ModeParamsHelper(const DispatchTypes::ModeParams param, con
         // It also makes more sense to not bubble it up, because this mode is specifically for INPUT_RECORD interop
         // and thus entirely between a PTY's input records and its INPUT_RECORD-aware VT-aware console clients.
         // Returning true here will mark this as being handled and avoid this.
+        if (!enable)
+        {
+            _api.GetStateMachine().InjectSequence(InjectionType::W32IM);
+        }
         return true;
     default:
         // If no functions to call, overall dispatch was a failure.

src/terminal/parser/stateMachine.hpp

@@ -42,8 +42,9 @@ namespace Microsoft::Console::VirtualTerminal
     // parser tells it the positions of any such relevant VT sequences.
     enum class InjectionType : size_t
     {
-        RIS,
-        DECSET_FOCUS,
+        RIS, // All of the below
+        DECSET_FOCUS, // CSI ? 1004 h
+        W32IM, // CSI ? 9001 h
 
         Count,
     };