Bug 575946: Fix accessibility on C element Filter

The description for filter text on C element Filter
dialog could not be read out.

Change-Id: I7c4884cca2c1fff3d872f4775e8529e4428c86ac
Reported-by: Gerald Mitchell <Gerald.Mitchell@ibm.com>
Signed-off-by: Gerald Mitchell <Gerald.Mitchell@ibm.com>

Author: GeraldMit

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/filters/CustomFiltersDialog.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2016 IBM Corporation and others.
+ * Copyright (c) 2000, 2021 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -138,6 +138,14 @@ protected Control createDialogArea(Composite parent) {
 		final Label info = new Label(group, SWT.LEFT);
 		info.setText(FilterMessages.CustomFiltersDialog_patternInfo);
 
+		// add the info text as a description to the pattern field
+		fUserDefinedPatterns.getAccessible().addAccessibleListener(new AccessibleAdapter() {
+			@Override
+			public void getDescription(AccessibleEvent e) {
+				e.result = FilterMessages.CustomFiltersDialog_patternInfo;
+			}
+		});
+
 		// Enabling / disabling of pattern group
 		fEnableUserDefinedPatterns.setSelection(fEnablePatterns);
 		fUserDefinedPatterns.setEnabled(fEnablePatterns);