[Gtk] Stop passing widget handle needlessly in Caret

Widget handle is not used at all thus it only creates confusion.

Author: akurtakov

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Canvas.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2025 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -171,18 +171,18 @@ long gtk_commit (long imcontext, long text) {
 long gtk_draw (long widget, long cairo) {
 	if ((state & OBSCURED) != 0) return 0;
 	long result = super.gtk_draw (widget, cairo);
-	drawCaretInFocus(widget, cairo);
+	drawCaretInFocus(cairo);
 	return result;
 }
 
 @Override
 void gtk4_draw (long widget, long cairo, Rectangle bounds) {
 	if ((state & OBSCURED) != 0) return;
 	super.gtk4_draw (widget, cairo, bounds);
-	drawCaretInFocus(widget, cairo);
+	drawCaretInFocus(cairo);
 }
 
-void drawCaretInFocus(long widget, long cairo) {
+void drawCaretInFocus(long cairo) {
 	/*
 	 *  blink is needed to be checked as gtk_draw() signals sent from other parts of the canvas
 	 *  can interfere with the blinking state. This will ensure that we are only draw/redrawing the
@@ -191,12 +191,12 @@ void drawCaretInFocus(long widget, long cairo) {
 	 *  Additionally, only draw the caret if it has focus. See bug 528819.
 	 */
 	if (caret != null && blink == true && caret.isFocusCaret()) {
-		drawCaret(widget,cairo);
+		drawCaret(cairo);
 		blink = false;
 	}
 }
 
-private void drawCaret(long widget, long cairo) {
+private void drawCaret(long cairo) {
 	if(this.isDisposed()) return;
 	if (cairo == 0) error(SWT.ERROR_NO_HANDLES);
 

bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/Caret.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2025 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -125,7 +125,7 @@ private void drawInCellEditor(long window) {
 	long cairo = GDK.gdk_cairo_create(window);
 	Point pt = display.map(parent, embeddedInto, new Point(0,0));
 	Cairo.cairo_translate (cairo, pt.x, pt.y);
-	parent.drawCaretInFocus(parent.handle, cairo);
+	parent.drawCaretInFocus(cairo);
 	Cairo.cairo_destroy(cairo);
 }