Paint editor fixes and credits

gui.js

@@ -2130,6 +2130,7 @@ IDE_Morph.prototype.aboutSnap = function () {
     creditsTxt = localize('Contributors')
         + '\n\nNathan Dinsmore: Saving/Loading, Snap-Logo Design, '
         + 'countless bugfixes'
+        + '\nKartik Chandra: Paint Editor'
         + '\nIan Reynolds: UI Design, Event Bindings, '
         + 'Sound primitives'
         + '\nIvan Motyashov: Initial Squeak Porting'

paint.js

@@ -208,16 +208,15 @@ PaintEditorMorph.prototype.buildEdits = function() {
 
 PaintEditorMorph.prototype.openIn = function(world, oldim, oldrc, callback) {
     // Open the editor in a world with an optional image to edit
-    this.setCenter(world.center());
     this.oldim = oldim;
     this.oldrc = oldrc.copy();
     this.callback = callback || nop;
-    world.add(this);
-    this.world().keyboardReceiver = this;
+
     this.processKeyUp = function() {
         this.shift = false;
         this.propertiesControls.constrain.refresh();
     };
+
     this.processKeyDown = function() {
         this.shift = this.world().currentKey === 16;
         this.propertiesControls.constrain.refresh();
@@ -235,8 +234,9 @@ PaintEditorMorph.prototype.openIn = function(world, oldim, oldrc, callback) {
             );
         this.paper.drawNew();
     }
-
-    this.fullChanged();
+
+    this.key = 'paint';
+    this.popUp(world);
 };
 
 PaintEditorMorph.prototype.fixLayout = function() {