SQL editor shutdown fix

plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/editors/text/ScriptPositionColumn.java

@@ -27,6 +27,7 @@ import org.eclipse.ui.progress.UIJob;
 import org.eclipse.ui.texteditor.ITextEditor;
 import org.eclipse.ui.texteditor.rulers.IContributedRulerColumn;
 import org.eclipse.ui.texteditor.rulers.RulerColumnDescriptor;
+import org.jkiss.dbeaver.core.DBeaverCore;
 import org.jkiss.dbeaver.ui.DBeaverIcons;
 import org.jkiss.dbeaver.ui.UIIcon;
 import org.jkiss.utils.ArrayUtils;
@@ -85,15 +86,20 @@ public class ScriptPositionColumn extends AbstractRulerColumn implements IContri
             @Override
             public IStatus runInUIThread(IProgressMonitor monitor)
             {
+                if (DBeaverCore.isClosing()) {
+                    return Status.CANCEL_STATUS;
+                }
                 BaseTextEditor editor = (BaseTextEditor)getEditor();
                 if (editor == null || editor.getTextViewer() == null) return Status.CANCEL_STATUS;
                 StyledText textWidget = editor.getTextViewer().getTextWidget();
                 if (textWidget == null || textWidget.isDisposed()) return Status.CANCEL_STATUS;
+                if (textWidget.isVisible()) {
                     int[] newCurrentLines = editor.getCurrentLines();
-                if (!Arrays.equals(newCurrentLines, currentLines) && textWidget.isVisible()) {
+                    if (!Arrays.equals(newCurrentLines, currentLines)) {
                         currentLines = newCurrentLines;
                         redraw();
                     }
+                }
                 if (visible) {
                     schedule(100);
                 }