limit minimum composite size to calculated shell size

in case controls return irregular small values to prevent a 2x2 hover
window

Author: ghentschke

bundles/org.eclipse.ui.genericeditor/src/org/eclipse/ui/internal/genericeditor/hover/CompositeInformationControl.java

@@ -175,7 +175,12 @@ private Point computeCompositeSize(Function<AbstractInformationControl, Point> c
 			Supplier<Point> getDefault) {
 		return controls.values().stream().map(computeSize).reduce(
 				(size1, size2) -> new Point(Math.max(size1.x, size2.x), size1.y + size2.y + layout.verticalSpacing))
-				.orElseGet(getDefault);
+				.map(size -> {
+					var shellSize = getShell().computeSize(SWT.DEFAULT, SWT.DEFAULT, true);
+					int width = Math.max(size.x, shellSize.x);
+					int height = Math.max(size.y, shellSize.y);
+					return new Point(width, height);
+				}).orElseGet(getDefault);
 	}
 
 }