Deprecate public bitmask methods in MarginInfo (#17565)

These methods are superceded by a copy constructor. getBitMask() and the
bitmask constructor are used in a few places around the framework, and
need to be refactored out - the MarginInfo class is already serializable
and can be used in lieu of the raw bitmask in the states of these
objects.

Change-Id: I39a6c25f03f3a2666c057ede99e8df54f5c57958

shared/src/main/java/com/vaadin/shared/ui/MarginInfo.java

@@ -49,7 +49,9 @@ public class MarginInfo implements Serializable {
      * 
      * @param bitMask
      *            bits to set
+     * @deprecated use other constructors instead of this one
      */
+    @Deprecated
     public MarginInfo(int bitMask) {
         this.bitMask = bitMask;
     }
@@ -85,6 +87,16 @@ public class MarginInfo implements Serializable {
         this(vertical, horizontal, vertical, horizontal);
     }
 
+    /**
+     * Creates a MarginInfo with the same values as another MarginInfo object.
+     * 
+     * @param other
+     *            another MarginInfo object
+     */
+    public MarginInfo(MarginInfo other) {
+        setMargins(other);
+    }
+
     /**
      * Enables or disables margins on all edges simultaneously.
      * 
@@ -172,9 +184,12 @@ public class MarginInfo implements Serializable {
 
     /**
      * Returns the current bit mask that make up the margin settings.
+     * <p>
+     * This method is for internal use by the framework.
      * 
      * @return an integer bit mask
      */
+    @Deprecated
     public int getBitMask() {
         return bitMask;
     }