[Android] Fix swkbd inline keyboard initial text sync and cursor position

When the game opens an inline keyboard with pre-filled text (e.g. a
previously saved Mii name), the text was stored in m_current_text on
the C++ side but never communicated to the Android IME. As a result,
the Android keyboard field appeared empty, backspace did nothing, and
typing replaced the existing text instead of appending to it.

The root cause: the game sends InlineTextChanged() with the pre-filled
text in the same Calc request as appear(), before ShowInlineKeyboard()
is called. m_current_text was not updated by InlineTextChanged, and
ShowInlineKeyboard was using the stale parameters.initial_text (set
during initialization before the text was known).

Fix on the C++ side:
- Initialize m_current_text from parameters.initial_text in
  InitializeKeyboard so each session starts clean.
- Update m_current_text in InlineTextChanged so the latest game text
  is always reflected.
- Pass m_current_text (not parameters.initial_text) as initial_text
  to Kotlin when calling executeInline.

Fix on the Kotlin side:
- Pre-populate imeEditable with the received initial text.
- Call Selection.setSelection to place the cursor at the end so that
  backspace and new input work correctly from the start.

src/android/app/src/main/java/org/yuzu/yuzu_emu/applets/keyboard/SoftwareKeyboard.kt

@@ -20,6 +20,7 @@ import java.io.Serializable
 import org.yuzu.yuzu_emu.NativeLibrary
 import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.applets.keyboard.ui.KeyboardDialogFragment
+import org.yuzu.yuzu_emu.overlay.InputOverlay
 
 @Keep
 object SoftwareKeyboard {
@@ -37,6 +38,7 @@ object SoftwareKeyboard {
         val emulationActivity = NativeLibrary.sEmulationActivity.get()
 
         val overlayView = emulationActivity!!.findViewById<View>(R.id.surface_input_overlay)
+        (overlayView as? InputOverlay)?.resetImeBuffer(config.initial_text ?: "")
         overlayView.requestFocus()
         val im =
             overlayView.context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager

src/android/app/src/main/java/org/yuzu/yuzu_emu/overlay/InputOverlay.kt

@@ -19,6 +19,7 @@ import android.os.Handler
 import android.os.Looper
 import android.text.Editable
 import android.text.InputType
+import android.text.Selection
 import android.util.AttributeSet
 import android.view.HapticFeedbackConstants
 import android.view.KeyEvent
@@ -57,6 +58,7 @@ class InputOverlay(context: Context, attrs: AttributeSet?) :
     private val overlayDpads: MutableSet<InputOverlayDrawableDpad> = HashSet()
     private val overlayJoysticks: MutableSet<InputOverlayDrawableJoystick> = HashSet()
     private val imeEditable = Editable.Factory.getInstance().newEditable("")
+    private var pendingInitialText: String = ""
 
     private var inEditMode = false
     private var gamelessMode = false
@@ -85,15 +87,24 @@ class InputOverlay(context: Context, attrs: AttributeSet?) :
 
     override fun onCheckIsTextEditor(): Boolean = true
 
+    fun resetImeBuffer(initialText: String = "") {
+        pendingInitialText = initialText
+    }
+
     override fun onCreateInputConnection(outAttrs: EditorInfo): InputConnection {
         imeEditable.clear()
+        if (pendingInitialText.isNotEmpty()) {
+            imeEditable.append(pendingInitialText)
+        }
+        pendingInitialText = ""
+        Selection.setSelection(imeEditable, imeEditable.length)
         outAttrs.inputType =
             InputType.TYPE_CLASS_TEXT or
                 InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS or
                 InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
         outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI or EditorInfo.IME_ACTION_DONE
-        outAttrs.initialSelStart = 0
-        outAttrs.initialSelEnd = 0
+        outAttrs.initialSelStart = imeEditable.length
+        outAttrs.initialSelEnd = imeEditable.length
 
         return object : BaseInputConnection(this, true) {
             override fun getEditable(): Editable = imeEditable

src/common/android/applets/software_keyboard.cpp

@@ -109,6 +109,7 @@ void AndroidKeyboard::InitializeKeyboard(
     }
 
     parameters = std::move(initialize_parameters);
+    m_current_text = parameters.initial_text;
 
     LOG_INFO(Frontend,
              "\nKeyboardInitializeParameters:"
@@ -185,9 +186,13 @@ void AndroidKeyboard::ShowInlineKeyboard(
 
     // Pivot to a new thread, as we cannot call GetEnvForThread() from a Fiber.
     m_is_inline_active = true;
-    std::thread([&] {
+    // Pass m_current_text as initial_text so Kotlin receives any text set via InlineTextChanged
+    // before this call (e.g. game pre-fills the field in the same Calc request as appear).
+    std::thread([&, current_text = m_current_text] {
+        Core::Frontend::KeyboardInitializeParameters p = parameters;
+        p.initial_text = current_text;
         GetEnvForThread()->CallStaticVoidMethod(s_software_keyboard_class, s_swkbd_execute_inline,
-                                                ToJKeyboardParams(parameters));
+                                                ToJKeyboardParams(p));
     }).join();
 }
 
@@ -207,6 +212,8 @@ void AndroidKeyboard::InlineTextChanged(
              "\ncursor_position={}",
              Common::UTF16ToUTF8(text_parameters.input_text), text_parameters.cursor_position);
 
+    m_current_text = text_parameters.input_text;
+
     submit_inline_callback(Service::AM::Frontend::SwkbdReplyType::ChangedString,
                            text_parameters.input_text, text_parameters.cursor_position);
 }

src/common/android/applets/software_keyboard.h

@@ -57,7 +57,7 @@ private:
 
 private:
     mutable bool m_is_inline_active{};
-    std::u16string m_current_text;
+    mutable std::u16string m_current_text;
 };
 
 // Should be called in JNI_Load