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
assertNumberOf("proposals", proposals.size(), 1);
		assertCorrectLabels(proposals);
		
		CUCorrectionProposal proposal= (CUCorrectionProposal) proposals.get(0);
		String preview= proposal.getCompilationUnitChange().getPreviewContent();
		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("    private static Vector[] fgVec2;\n");
		buf.append("\n");
		buf.append("    public static void foo(int count, Vector vec[]) {\n");
		buf.append("        E.fgVec2 = vec;\n");
		buf.append("        count++;\n");
		buf.append("    }\n");
		buf.append("}\n");
		assertEqualString(preview, buf.toString());	
	}
	
	public void testAssignParamToField4() throws Exception {
		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("public class E {\n");
		buf.append("    private long count;\n");