Add function to hide tooltip immediately

The built in delay causes trouble on wayland where it can cause
closing of other popups.

src/declarativeimports/core/tooltip.cpp

@@ -256,6 +256,12 @@ void ToolTip::hideToolTip()
     tooltipDialogInstance()->dismiss();
 }
 
+void ToolTip::hideImmediately()
+{
+    m_showTimer->stop();
+    tooltipDialogInstance()->setVisible(false);
+}
+
 QVariant ToolTip::icon() const
 {
     if (m_icon.isValid()) {

src/declarativeimports/core/tooltip.h

@@ -164,10 +164,16 @@ public Q_SLOTS:
     void showToolTip();
 
     /**
-     * Hides the tooltip if shown. Does not affect whether the tooltip area is active.
+     * Hides the tooltip after a grace period if shown. Does not affect whether the tooltip area is active.
      */
     void hideToolTip();
 
+    /**
+     * Hides the tooltip immediately, in comparison to hideToolTip.
+     * @since 5.84
+     */
+    void hideImmediately();
+
 protected:
     /// @cond INTERNAL_DOCS
     bool childMouseEventFilter(QQuickItem *item, QEvent *event) override;