Bug 43489 Conflicts between "Segmented Java Editor" and "Correct Indentation"
I20030917 + plugin export for smoke test Correct Indentation (Ctrl+I) causes problems in segmented java editor (Toolbar > click "Show Source of selected element only"). - org.junit as source - open TestCase.java - enable "Show Source of selected element only" - select method "run()" in outline - set cursor to 1:1 - Ctrl+I -> whole type becomes visible in editor - select method "run()" in outline again - manually mangle indentation by insterting/deleting tabs - Ctrl+A, Ctrl+I -> whole type becomes visible in editor - Ctrl+Z (Undo) -> the undo TextEdits are applied to the wrong offset and destroy +/- arbitrary parts of my source!
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/actions/IndentAction.java
IDocumentProvider provider= editor.getDocumentProvider();
			IEditorInput input= editor.getEditorInput();
			if (provider != null && input != null)
				return provider.getDocument(input);
			
		}
		return null;
	}
	
	/**
	 * Returns the selection on the editor or an invalid selection if none can be obtained. Returns
	 * never <code>null</code>.
	 * 
	 * @return the current selection, never <code>null</code>
	 */
	private ITextSelection getSelection() {
		ISelectionProvider provider= getSelectionProvider();
		if (provider != null) {
			
			ISelection selection= provider.getSelection();
			if (selection instanceof ITextSelection)
				return (ITextSelection) selection;
		}
		
		
		return TextSelection.emptySelection();
	}
	
}