Fix save list, delete save, exit without saving, and blank username on Windows64 (#539)

* Fix world save rename not applying new name

KeyboardCompleteWorldNameCallback had no _WINDOWS64 branch, so the
typed name was validated then silently discarded on every rename attempt.

Write the new name to a worldname.txt sidecar file next to the save
(Windows64\GameHDD\{folder}\worldname.txt) and update the in-memory
display name immediately. ReadLevelNameFromSaveFile now checks for this
sidecar first so renamed saves persist correctly across restarts.

* Fixed gamertag being blank upon renaming and re-joining a save

* Save deletion fix, exiting without saving fix

* Add native in-game keyboard UI for world naming and renaming

Minecraft.Client/Windows64/KeyboardMouseInput.cpp

@@ -55,6 +55,8 @@ void KeyboardMouseInput::Init()
 	m_hasInput = false;
 	m_kbmActive = true;
 	m_screenWantsCursorHidden = false;
+	m_charBufferHead = 0;
+	m_charBufferTail = 0;
 
 	RAWINPUTDEVICE rid;
 	rid.usUsagePage = 0x01; // HID_USAGE_PAGE_GENERIC
@@ -381,4 +383,29 @@ float KeyboardMouseInput::GetLookY(float sensitivity) const
 	return (float)(-m_mouseDeltaY) * sensitivity;
 }
 
+void KeyboardMouseInput::OnChar(wchar_t c)
+{
+	int next = (m_charBufferHead + 1) % CHAR_BUFFER_SIZE;
+	if (next != m_charBufferTail)
+	{
+		m_charBuffer[m_charBufferHead] = c;
+		m_charBufferHead = next;
+	}
+}
+
+bool KeyboardMouseInput::ConsumeChar(wchar_t &outChar)
+{
+	if (m_charBufferTail == m_charBufferHead)
+		return false;
+	outChar = m_charBuffer[m_charBufferTail];
+	m_charBufferTail = (m_charBufferTail + 1) % CHAR_BUFFER_SIZE;
+	return true;
+}
+
+void KeyboardMouseInput::ClearCharBuffer()
+{
+	m_charBufferHead = 0;
+	m_charBufferTail = 0;
+}
+
 #endif // _WINDOWS64

Minecraft.Client/Windows64/KeyboardMouseInput.h

@@ -84,6 +84,11 @@ public:
 	void SetScreenCursorHidden(bool hidden) { m_screenWantsCursorHidden = hidden; }
 	bool IsScreenCursorHidden() const { return m_screenWantsCursorHidden; }
 
+	// Text input: buffer characters typed while the native keyboard scene is open
+	void OnChar(wchar_t c);
+	bool ConsumeChar(wchar_t &outChar);
+	void ClearCharBuffer();
+
 	float GetMoveX() const;
 	float GetMoveY() const;
 
@@ -129,6 +134,11 @@ private:
 	bool m_kbmActive;
 
 	bool m_screenWantsCursorHidden;
+
+	static const int CHAR_BUFFER_SIZE = 32;
+	wchar_t m_charBuffer[CHAR_BUFFER_SIZE];
+	int m_charBufferHead;
+	int m_charBufferTail;
 };
 
 extern KeyboardMouseInput g_KBMInput;

Minecraft.Client/Windows64/Windows64_Minecraft.cpp

@@ -565,6 +565,12 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 		g_KBMInput.SetWindowFocused(true);
 		break;
 
+	case WM_CHAR:
+		// Buffer typed characters so UIScene_Keyboard can dispatch them to the Iggy Flash player
+		if (wParam >= 0x20 || wParam == 0x08 || wParam == 0x0D) // printable chars + backspace + enter
+			g_KBMInput.OnChar((wchar_t)wParam);
+		break;
+
 	case WM_KEYDOWN:
 	case WM_SYSKEYDOWN:
 	{