D7: editor multi-cursor support

Add secondary_cursors field to Editor with insert_char_multi,
delete_back_multi, delete_forward_multi methods. Right-to-left
processing ensures position shifts don't corrupt earlier insertions.

7 new tests: add/clear, all_positions, insert, delete_back,
delete_forward, unicode, duplicate-add.

local/recipes/kde/kf6-kguiaddons/source/examples/python/kcolorschemewatcher.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2025 Nicolas Fella <nicolas.fella@gmx.de>
+# SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+import sys
+
+from KGuiAddons import KColorSchemeWatcher
+
+from PySide6 import QtCore
+
+def print_preference(preference):
+    if preference == KColorSchemeWatcher.NoPreference:
+        print("No preference")
+    if preference == KColorSchemeWatcher.PreferDark:
+        print("Dark")
+    if preference == KColorSchemeWatcher.PreferLight:
+        print("Light")
+    if preference == KColorSchemeWatcher.PreferHighContrast:
+        print("High Contrast")
+
+
+app = QtCore.QCoreApplication()
+
+watcher = KColorSchemeWatcher()
+
+print_preference(watcher.systemPreference())
+
+watcher.systemPreferenceChanged.connect(lambda: print_preference(watcher.systemPreference()))
+
+sys.exit(app.exec())

local/recipes/kde/kf6-kguiaddons/source/examples/python/kdatevalidator.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2025 Nicolas Fella <nicolas.fella@gmx.de>
+# SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+import sys
+from PySide6 import QtCore, QtWidgets, QtGui
+from KGuiAddons import KDateValidator
+
+class MyWidget(QtWidgets.QWidget):
+    def __init__(self):
+        super().__init__()
+
+        self.input = QtWidgets.QLineEdit()
+        self.input.editingFinished.connect(self.onEditFinished)
+
+        validator = KDateValidator()
+        self.input.setValidator(validator)
+
+        self.layout = QtWidgets.QVBoxLayout(self)
+        self.layout.addWidget(self.input)
+
+    @QtCore.Slot()
+    def onEditFinished(self):
+        print("Got valid input")
+
+if __name__ == "__main__":
+    app = QtWidgets.QApplication([])
+
+    widget = MyWidget()
+    widget.resize(800, 600)
+    widget.show()
+
+    sys.exit(app.exec())

local/recipes/kde/kf6-kguiaddons/source/examples/python/kiconutils.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2025 Nicolas Fella <nicolas.fella@gmx.de>
+# SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+import sys
+from PySide6 import QtCore, QtWidgets, QtGui
+from KGuiAddons import KIconUtils
+
+class MyWidget(QtWidgets.QWidget):
+    def __init__(self):
+        super().__init__()
+
+        self.icon = KIconUtils.addOverlays(QtGui.QIcon.fromTheme("cuttlefish"), ["edit-entry", "edit-delete"])
+
+        self.label = QtWidgets.QLabel()
+        self.label.setPixmap(self.icon.pixmap(64))
+
+        self.layout = QtWidgets.QVBoxLayout(self)
+        self.layout.addWidget(self.label)
+
+if __name__ == "__main__":
+    app = QtWidgets.QApplication([])
+
+    widget = MyWidget()
+    widget.resize(800, 600)
+    widget.show()
+
+    sys.exit(app.exec())

local/recipes/kde/kf6-kguiaddons/source/examples/python/ksystemclipboard.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+"""
+SPDX-FileCopyrightText: 2025 David Edmundson <davidedmundson@kde.org>
+SPDX-FileCopyrightText: 2026 Fushan Wen <qydwhotmail@gmail.com>
+SPDX-License-Identifier: LGPL-2.0-or-later
+"""
+
+import sys
+
+from KGuiAddons import KSystemClipboard
+from PySide6.QtCore import QMimeData, Slot
+from PySide6.QtGui import QClipboard
+from PySide6.QtWidgets import (QApplication, QHBoxLayout, QLabel, QPushButton, QSizePolicy, QTextEdit, QVBoxLayout, QWidget)
+
+
+class KSystemClipboardExample(QWidget):
+
+    def __init__(self) -> None:
+        super().__init__()
+        self.setWindowTitle("KSystemClipboard")
+        self.__setup_ui()
+
+    def __setup_ui(self) -> None:
+        self.system_clipboard_view = QTextEdit()
+        self.system_text_edit = QTextEdit()
+        self.__setup_system_clipboard()
+
+        self.resize(600, 500)
+
+    def __setup_system_clipboard(self) -> None:
+        clipboard = KSystemClipboard.instance()
+
+        layout = QVBoxLayout(self)
+
+        title_label = QLabel("System Clipboard (KSystemClipboard)")
+        layout.addWidget(title_label)
+
+        self.system_clipboard_view.setReadOnly(True)
+        self.system_clipboard_view.setMinimumHeight(200)
+        self.system_clipboard_view.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+
+        clipboard.changed.connect(self.on_system_clipboard_changed)
+
+        self.system_clipboard_view.setText(clipboard.text(QClipboard.Mode.Clipboard))
+
+        layout.addWidget(self.system_clipboard_view)
+
+        self.system_text_edit.setPlaceholderText("Enter clipboard content here…")
+        self.system_text_edit.setMinimumHeight(120)
+        self.system_text_edit.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+        layout.addWidget(self.system_text_edit)
+
+        btn_row = QHBoxLayout()
+        btn_row.addStretch()
+
+        submit_btn = QPushButton("Submit")
+        submit_btn.clicked.connect(self.submit_system_clipboard)
+        btn_row.addWidget(submit_btn)
+
+        layout.addLayout(btn_row)
+
+    @Slot(QClipboard.Mode)
+    def on_system_clipboard_changed(self, mode) -> None:
+        if mode != QClipboard.Mode.Clipboard:
+            return
+        clipboard = KSystemClipboard.instance()
+        self.system_clipboard_view.setText(clipboard.text(mode))
+
+    @Slot()
+    def submit_system_clipboard(self) -> None:
+        clipboard = KSystemClipboard.instance()
+        mime_data = QMimeData()
+        mime_data.setText(self.system_text_edit.toPlainText())
+        clipboard.setMimeData(mime_data, QClipboard.Mode.Clipboard)
+
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+
+    window = KSystemClipboardExample()
+    window.show()
+
+    sys.exit(app.exec())