Add preedit styling support for text-input-v2.

src/inputmethod.cpp

@@ -457,6 +457,13 @@ void InputMethod::setPreeditCursor(qint32 index)
     }
 }
 
+void InputMethod::setPreeditStyling(quint32 index, quint32 length, quint32 style)
+{
+    auto t2 = waylandServer()->seat()->textInputV2();
+    if (t2 && t2->isEnabled()) {
+        t2->preEditStyling(index, length, style);
+    }
+}
 
 void InputMethod::setPreeditString(uint32_t serial, const QString &text, const QString &commit)
 {
@@ -524,6 +531,7 @@ void InputMethod::adoptInputMethodContext()
     connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::commitString, this, &InputMethod::commitString, Qt::UniqueConnection);
     connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::deleteSurroundingText, this, &InputMethod::deleteSurroundingText, Qt::UniqueConnection);
     connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::cursorPosition, this, &InputMethod::setCursorPosition, Qt::UniqueConnection);
+    connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::preeditStyling, this, &InputMethod::setPreeditStyling, Qt::UniqueConnection);
     connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::preeditString, this, &InputMethod::setPreeditString, Qt::UniqueConnection);
     connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::preeditCursor, this, &InputMethod::setPreeditCursor, Qt::UniqueConnection);
     connect(inputContext, &KWaylandServer::InputMethodContextV1Interface::keyboardGrabRequested, this, &InputMethod::installKeyboardGrab, Qt::UniqueConnection);

src/inputmethod.h

@@ -77,6 +77,7 @@ private Q_SLOTS:
 
     // inputcontext slots
     void setPreeditString(uint32_t serial, const QString &text, const QString &commit);
+    void setPreeditStyling(quint32 index, quint32 length, quint32 style);
     void setPreeditCursor(qint32 index);
     void key(quint32 serial, quint32 time, quint32 key, bool pressed);
     void modifiers(quint32 serial, quint32 mods_depressed, quint32 mods_latched, quint32 mods_locked, quint32 group);