Bug 43248 "Assign statement to local variable" removes preceeding comment [quick assist] [ast rewrite]
Consider the method public void a() { // here is a comment System.getenv("");X } where X denotes the cursor. If the quick fix "Assign statement to local variable" is used the comment disapears...
org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/quickfix/AssistQuickFixTest.java
buf.append("\n");
		buf.append("    public  E(int count, Vector vec[]) {\n");
		buf.append("        super();\n");
		buf.append("        fVec = vec;\n");		
		buf.append("    }\n");
		buf.append("}\n");
		assertEqualString(preview, buf.toString());	
	}
	public void testAssignParamToField3() throws Exception {
		Preferences corePrefs= JavaCore.getPlugin().getPluginPreferences();
		corePrefs.setValue(JavaCore.CODEASSIST_STATIC_FIELD_PREFIXES, "fg");
		IPreferenceStore store= JavaPlugin.getDefault().getPreferenceStore();
		store.setValue(PreferenceConstants.CODEGEN_KEYWORD_THIS, true);
		
		IPackageFragment pack1= fSourceFolder.createPackageFragment("test1", false, null);
		StringBuffer buf= new StringBuffer();
		buf.append("package test1;\n");
		buf.append("import java.util.Vector;\n");
		buf.append("public class E {\n");
		buf.append("    private int fgVec;\n");
		buf.append("\n");
		buf.append("    public static void foo(int count, Vector vec[]) {\n");
		buf.append("        count++;\n");
		buf.append("    }\n");
		buf.append("}\n");
		ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
				
		int offset= buf.toString().indexOf("vec[]");
		AssistContext context= getCorrectionContext(cu, offset, 0);
		List proposals= collectAssists(context, false);