Disable autoscaling for GrapicalEditors

This commit applies the disabledment of SWT autoscaling to the
FlyoutPaletteComposite and the Splitter for the GrephicalEditorWithPalette instead of only the FigureCanvas instances. This ensures a consistent
zoom context for all child elements, e.g. rulers or other custom child
elements.

Author: akoch-yatta

org.eclipse.gef/src/org/eclipse/gef/ui/palette/FlyoutPaletteComposite.java

@@ -81,10 +81,12 @@
 import org.eclipse.draw2d.LightweightSystem;
 import org.eclipse.draw2d.MarginBorder;
 import org.eclipse.draw2d.PositionConstants;
+import org.eclipse.draw2d.ScalableLightweightSystem;
 import org.eclipse.draw2d.TextUtilities;
 import org.eclipse.draw2d.Triangle;
 import org.eclipse.draw2d.geometry.Dimension;
 import org.eclipse.draw2d.internal.DrawableTextUtilities;
+import org.eclipse.draw2d.internal.InternalDraw2dUtils;
 
 import org.eclipse.gef.GraphicalViewer;
 import org.eclipse.gef.dnd.TemplateTransfer;
@@ -188,6 +190,8 @@ public void perspectiveChanged(IWorkbenchPage page, IPerspectiveDescriptor persp
 	public FlyoutPaletteComposite(Composite parent, int style, IWorkbenchPage page, PaletteViewerProvider pvProvider,
 			FlyoutPreferences preferences) {
 		super(parent, style | SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE | SWT.DOUBLE_BUFFERED);
+		InternalDraw2dUtils.configureForAutoscalingMode(this, scale -> {
+		});
 		provider = pvProvider;
 		prefs = preferences;
 		sash = createSash();
@@ -1217,7 +1221,7 @@ private String getButtonTooltipText() {
 
 		private void init() {
 			setCursor(Cursors.ARROW);
-			lws = new LightweightSystem();
+			lws = InternalDraw2dUtils.isAutoScaleEnabled() ? new ScalableLightweightSystem() : new LightweightSystem();
 			lws.setControl(this);
 			final ArrowButton b = new ArrowButton(getArrowDirection());
 			b.setRolloverEnabled(true);
@@ -1356,7 +1360,7 @@ public void focusLost(FocusEvent fe) {
 				}
 			});
 
-			lws = new LightweightSystem();
+			lws = InternalDraw2dUtils.isAutoScaleEnabled() ? new ScalableLightweightSystem() : new LightweightSystem();
 			lws.setControl(this);
 			lws.setContents(contents);
 			setCursor(Cursors.SIZEALL);

org.eclipse.gef/src/org/eclipse/gef/ui/parts/GraphicalEditorWithPalette.java

@@ -15,6 +15,8 @@
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.widgets.Composite;
 
+import org.eclipse.draw2d.internal.InternalDraw2dUtils;
+
 import org.eclipse.gef.DefaultEditDomain;
 import org.eclipse.gef.palette.PaletteRoot;
 import org.eclipse.gef.ui.palette.PaletteViewer;
@@ -58,6 +60,8 @@ protected void createPaletteViewer(Composite parent) {
 	@Override
 	public void createPartControl(Composite parent) {
 		Splitter splitter = new Splitter(parent, SWT.HORIZONTAL);
+		InternalDraw2dUtils.configureForAutoscalingMode(splitter, scale -> {
+		});
 		createPaletteViewer(splitter);
 		createGraphicalViewer(splitter);
 		splitter.maintainSize(getPaletteViewer().getControl());