Radial: warp the mouse to the pane after a focus-change split action

When a radial slice fires a go_*_split_view action (Focus Left/Right/Up/
Down/Next/Prev), warp the OS pointer onto the center of the newly active
view so the mouse follows the keyboard focus. Deferred via a 0ms timer so
Kate finishes activating the target view first. Scoped to the six pane-
focus actions only — other radial activations and ordinary view changes
(clicks, file opens) do not move the pointer.

src/plugin/ollieplugin.cpp

@@ -25,6 +25,7 @@
 
 #include <QAction>
 #include <QApplication>
+#include <QCursor>
 #include <QDateTime>
 #include <QDir>
 #include <QEvent>
@@ -35,6 +36,7 @@
 #include <QMouseEvent>
 #include <QSet>
 #include <QStandardPaths>
+#include <QTimer>
 #include <QUrl>
 #include <QWidget>
 
@@ -43,6 +45,19 @@ namespace katecustom
 
 namespace
 {
+// True for the Kate actions that move keyboard focus to another split pane.
+// After one of these fires we warp the mouse pointer onto the new pane so the
+// cursor follows the focus (mouse-first UX).
+bool isPaneFocusAction(const QString &id)
+{
+    return id == QLatin1String("go_left_split_view")
+        || id == QLatin1String("go_right_split_view")
+        || id == QLatin1String("go_upward_split_view")
+        || id == QLatin1String("go_downward_split_view")
+        || id == QLatin1String("go_next_split_view")
+        || id == QLatin1String("go_prev_split_view");
+}
+
 // Bracket pairs understood by the double-click selection feature.
 QChar matchingBracket(QChar c, bool &isOpener)
 {
@@ -1136,9 +1151,26 @@ void OllieView::onRadialActivated(const QString &actionId)
     }
     if (QAction *a = findActionByName(actionId)) {
         a->trigger();
+        // If this moved focus to another split pane, warp the pointer onto that
+        // pane so the mouse follows the focus. Deferred to the next event-loop
+        // turn so Kate has finished activating the target view first.
+        if (isPaneFocusAction(actionId)) {
+            QTimer::singleShot(0, this, [this]() { warpCursorToActiveView(); });
+        }
     }
 }
 
+void OllieView::warpCursorToActiveView()
+{
+    KTextEditor::View *view = m_mainWindow->activeView();
+    if (!view) {
+        return;
+    }
+    // KTextEditor::View is a QWidget; center the pointer in its editing area.
+    const QPoint center = view->mapToGlobal(view->rect().center());
+    QCursor::setPos(center);
+}
+
 // ---------------------------------------------------------------------------
 // Acme-style line-editing keys
 //

src/plugin/ollieplugin.h

@@ -89,6 +89,10 @@ private:
     // Size and place a palette: it spans the active window's width (minus a
     // small margin), anchored near the top.
     void positionPalette(PaletteWidget *palette);
+
+    // Move the OS pointer onto the center of the active view — used after a
+    // radial pane-focus action so the mouse follows the keyboard focus.
+    void warpCursorToActiveView();
     // One harvested, runnable action with the provenance needed to build a
     // unique id and to disambiguate labels shared by several commands.
     struct ActionEntry {