Prevent FigureCanvas from propagating autoscale disablement to children

FigureCanvas may contain SWT widgets as children. While FigureCanvas
itself is autoscale disabled (scaling handled by GEF), child SWT widgets
like cell editors should remain auto-scale enabled.

This behavior is achieved by setting a flag on the control that prevents
autoscale disablement from being propagated to its children.

Fixes #837

Author: arunjose696

org.eclipse.draw2d/src/org/eclipse/draw2d/FigureCanvas.java

@@ -25,6 +25,7 @@
 import org.eclipse.draw2d.geometry.Dimension;
 import org.eclipse.draw2d.geometry.Point;
 import org.eclipse.draw2d.geometry.Rectangle;
+import org.eclipse.draw2d.internal.InternalDraw2dUtils;
 
 /**
  * A scrolling Canvas that contains {@link Figure Figures} viewed through a
@@ -160,6 +161,7 @@ public FigureCanvas(int style, Composite parent, LightweightSystem lws) {
 		this.lws = lws;
 		lws.setControl(this);
 		hook();
+		InternalDraw2dUtils.setPropagateAutoScaleDisabled(this, false);
 	}
 
 	/**

org.eclipse.draw2d/src/org/eclipse/draw2d/internal/InternalDraw2dUtils.java

@@ -44,6 +44,12 @@ public class InternalDraw2dUtils {
 	 */
 	private static final String DATA_AUTOSCALE_DISABLED = "AUTOSCALE_DISABLED"; //$NON-NLS-1$
 
+	/**
+	 * Data that can be set to make a control not propagate autoScale disabling to
+	 * children.
+	 */
+	private static final String DATA_PROPOGATE_AUTOSCALE_DISABLED = "PROPOGATE_AUTOSCALE_DISABLED"; //$NON-NLS-1$
+
 	private static final boolean enableAutoScale = "win32".equals(SWT.getPlatform()) //$NON-NLS-1$
 			&& Boolean.parseBoolean(System.getProperty(DRAW2D_ENABLE_AUTOSCALE, Boolean.TRUE.toString()))
 			&& SWT.getVersion() >= 4971; // SWT 2025-12 release or higher
@@ -61,6 +67,13 @@ public static void configureForAutoscalingMode(Control control, Consumer<Double>
 		zoomConsumer.accept(InternalDraw2dUtils.calculateScale(control));
 	}
 
+	public static void setPropagateAutoScaleDisabled(Control control, boolean propagate) {
+		if (control == null || !isAutoScaleEnabled()) {
+			return;
+		}
+		control.setData(DATA_PROPOGATE_AUTOSCALE_DISABLED, propagate);
+	}
+
 	private static double calculateScale(Control control) {
 		int shellZoom;
 		try {