added "costume" selector to MY dropdown

HISTORY.md

@@ -31,6 +31,7 @@
     * added "neg", "lg" (log2) and "2^" selectors to monadic function reporter in Operators
     * added "^" reporter (power of) in the Operators category
     * added "width" and "height" as attribute selectors of the OF primitive for the stage
+    * added "costume" selector to the MY attributes dropdown
     * special context-aware drop-downs for custom blocks
     * new "stick to" submenu in the sprite context menu where applicable
     * multi-line and monospaced "code" input slots for custom blocks
@@ -75,6 +76,8 @@
 
 ### 2019-04-30
 * Blocks, Threads: added "id" to image attributes dropdown
+* Blocks, Threads: removed "id" from image attributes
+* Blocks, Threads: added "costume" selector to MY dropdown
 
 ### 2019-04-29
 * optimized animation library

src/blocks.js

@@ -1015,7 +1015,6 @@ SyntaxElementMorph.prototype.labelPart = function (spec) {
                 null, // text
                 false, // numeric?
                 {
-                    'id' : ['id'],
                     'name' : ['name'],
                     'width' : ['width'],
                     'height' : ['height'],
@@ -8859,6 +8858,7 @@ InputSlotMorph.prototype.gettablesMenu = function () {
         }
     }
     dict.name = ['name'];
+    dict.costume = ['costume'];
     dict.costumes = ['costumes'];
     dict.sounds = ['sounds'];
     dict['dangling?'] = ['dangling?'];

src/threads.js

@@ -4102,6 +4102,8 @@ Process.prototype.reportGet = function (query) {
             return thisObj.name;
         case 'stage':
             return thisObj.parentThatIsA(StageMorph);
+        case 'costume':
+            return thisObj.costume;
         case 'costumes':
             return thisObj.reportCostumes();
         case 'sounds':
@@ -4574,7 +4576,6 @@ Process.prototype.reportGetImageAttribute = function (choice, name) {
         return cst.height();
     case 'pixels':
         return cst.rasterized().pixels();
-    case 'id':
     default:
         return cst;
     }