Prevent mouse wheel from changing selection in product and application

combo

Disables mouse wheel scrolling on the product and application selection
combo to avoid
accidental selection changes when the user scrolls over the control.

This improves usability when the combo is hovered during scroll
operations, especially in scrollable containers.

Fixes: eclipse-pde#1854

Author: vogella

ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/editor/product/ProductInfoSection.java

@@ -231,7 +231,10 @@ private void createProductEntry(Composite client, FormToolkit toolkit) {
 		fProductCombo.add(""); //$NON-NLS-1$
 		fProductCombo.addSelectionListener(
 				widgetSelectedAdapter(e -> getProduct().setProductId(fProductCombo.getSelection())));
-
+		fProductCombo.getControl().addListener(SWT.MouseWheel, event -> {
+			// Cancel the event to prevent default scrolling
+			event.doit = false;
+		});
 		Button button = toolkit.createButton(client, PDEUIMessages.ProductInfoSection_new, SWT.PUSH);
 		button.setEnabled(isEditable());
 		button.addSelectionListener(widgetSelectedAdapter(e -> handleNewDefinition()));
@@ -264,7 +267,10 @@ private void createApplicationEntry(Composite client, FormToolkit toolkit) {
 		fAppCombo.add(""); //$NON-NLS-1$
 		fAppCombo.addSelectionListener(
 				widgetSelectedAdapter(e -> getProduct().setApplication(fAppCombo.getSelection())));
-
+		fProductCombo.getControl().addListener(SWT.MouseWheel, event -> {
+			// Cancel the event to prevent default scrolling
+			event.doit = false;
+		});
 		fAppCombo.getControl().setEnabled(isEditable());
 	}