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org.eclipse.core.runtime.AssertionFailedException: assertion failed: at org.eclipse.core.runtime.Assert.isTrue(Assert.java:109) at org.eclipse.core.runtime.Assert.isTrue(Assert.java:95) at org.eclipse.ui.internal.texteditor.quickdiff.DocumentLineDiffer.handleAboutToBeChanged(DocumentLineDiffer.java:775) at org.eclipse.ui.internal.texteditor.quickdiff.DocumentLineDiffer.documentAboutToBeChanged(DocumentLineDiffer.java:744) at org.eclipse.jface.text.AbstractDocument.fireDocumentAboutToBeChanged(AbstractDocument.java:606) at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1072) at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1091) at org.eclipse.jface.text.DefaultDocumentAdapter.replaceTextRange(DefaultDocumentAdapter.java:248) at org.eclipse.swt.custom.StyledText.modifyContent(StyledText.java:5757) at org.eclipse.swt.custom.StyledText.sendKeyEvent(StyledText.java:6500) at org.eclipse.swt.custom.StyledText.doContent(StyledText.java:2155) at org.eclipse.swt.custom.StyledText.handleKey(StyledText.java:5029) at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:5054) at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:4800) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:975) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:971) at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1285)