Ensure AbsoluteLayout wrappers have the rigth size (#8313)

WebContent/VAADIN/themes/base/absolutelayout/absolutelayout.css

@@ -1,4 +1,14 @@
 .v-absolutelayout-wrapper {
 	position: absolute;
 	overflow: hidden;
-}
+}
+.v-absolutelayout-margin, .v-absolutelayout-canvas {
+	box-sizing: border-box;
+	-moz-box-sizing: border-box;
+}
+.v-absolutelayout.v-has-height > div, .v-absolutelayout.v-has-height > div > div {
+	height: 100%;
+}
+.v-absolutelayout.v-has-width > div, .v-absolutelayout.v-has-width > div > div {
+	width: 100%;
+}

src/com/vaadin/terminal/gwt/client/ui/VAbsoluteLayout.java

@@ -47,6 +47,9 @@ public class VAbsoluteLayout extends ComplexPanel {
         canvas.getStyle().setProperty("overflow", "hidden");
         marginElement.appendChild(canvas);
         getElement().appendChild(marginElement);
+
+        canvas.setClassName(CLASSNAME + "-canvas");
+        canvas.setClassName(CLASSNAME + "-margin");
     }
 
     AbsoluteWrapper getWrapper(ApplicationConnection client, UIDL componentUIDL) {
@@ -66,22 +69,6 @@ public class VAbsoluteLayout extends ComplexPanel {
         super.add(child, canvas);
     }
 
-    @Override
-    public void setWidth(String width) {
-        super.setWidth(width);
-        // TODO do this so that canvas gets the sized properly (the area
-        // inside marginals)
-        canvas.getStyle().setProperty("width", width);
-    }
-
-    @Override
-    public void setHeight(String height) {
-        super.setHeight(height);
-        // TODO do this so that canvas gets the sized properly (the area
-        // inside marginals)
-        canvas.getStyle().setProperty("height", height);
-    }
-
     public class AbsoluteWrapper extends SimplePanel {
         private String css;
         String left;