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
} else
			tab= "\t"; 
	
		return tab;
	}
	/**
	 * Returns the editor's selection provider.
	 * 
	 * @return the editor's selection provider or <code>null</code>
	 */
	private ISelectionProvider getSelectionProvider() {
		ITextEditor editor= getTextEditor();
		if (editor != null) {
			return editor.getSelectionProvider();
		}
		return null;
	}
	
	/*
	 * @see org.eclipse.ui.texteditor.IUpdate#update()
	 */
	public void update() {
		super.update();
		
		if (isEnabled())
			if (fIsTabAction)
				setEnabled(canModifyEditor() && isSmartMode() && isValidSelection());
			else
				setEnabled(canModifyEditor() && !getSelection().isEmpty());
	}