De-register resources with zoom support from device

Resources with zoom support are registered at their device so that
handles for zoom levels that are not necessary anymore can be disposed.
When these resources are destroyed, they are currently not de-registered
form their device, potentially leading to resource leaks. This change
makes the resources de-register themselves form their device when being
destroyed.

Supplements
#1477

Author: HeikoKlare

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Device.java

@@ -959,6 +959,10 @@ void registerResourceWithZoomSupport(Resource resource) {
 	resourcesWithZoomSupport.add(resource);
 }
 
+void deregisterResourceWithZoomSupport(Resource resource) {
+	resourcesWithZoomSupport.remove(resource);
+}
+
 /**
  * Destroys the handles of all the resources in the resource tracker by
  * identifying the zoom levels which is not valid for any monitor

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java

@@ -1187,6 +1187,7 @@ long initNative(String filename, int zoom) {
 
 @Override
 void destroy () {
+	device.deregisterResourceWithZoomSupport(this);
 	if (memGC != null) memGC.dispose();
 	destroyHandle();
 	memGC = null;

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Path.java

@@ -437,6 +437,7 @@ void cubicToInPixels(float cx1, float cy1, float cx2, float cy2, float x, float
 
 @Override
 void destroy() {
+	device.deregisterResourceWithZoomSupport(this);
 	zoomLevelToHandle.values().forEach(Gdip::GraphicsPath_delete);
 	zoomLevelToHandle.clear();
 }

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Pattern.java

@@ -261,6 +261,7 @@ void setImageHandle(Image image, int zoom) {
 
 @Override
 void destroy() {
+	device.deregisterResourceWithZoomSupport(this);
 	for (long handle: zoomLevelToHandle.values()) {
 		destroyHandle(handle);
 	}

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Region.java

@@ -223,6 +223,7 @@ public boolean contains (Point pt) {
 
 @Override
 void destroy () {
+	device.deregisterResourceWithZoomSupport(this);
 	zoomToHandle.values().forEach(handle -> OS.DeleteObject(handle));
 	zoomToHandle.clear();
 	operations.clear();

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Transform.java

@@ -156,6 +156,7 @@ static float[] checkTransform(float[] elements) {
 
 @Override
 void destroy() {
+	device.deregisterResourceWithZoomSupport(this);
 	zoomLevelToHandle.values().forEach(Gdip::Matrix_delete);
 	zoomLevelToHandle.clear();
 }