fix multi-widget load grouping, reload same file with import

src/kiri/init.js

@@ -2180,6 +2180,7 @@ gapp.register("kiri.init", [], (root, exports) => {
 
         ui.load.onchange = function(event) {
             api.platform.load_files(event.target.files);
+            ui.load.value = ''; // reset so you can re-import the same filee
         };
 
         ui.sliderMin.onclick = () => {

src/kiri/platform.js

@@ -725,7 +725,9 @@ function platformLoadFiles(files, group) {
         reader.file = files[i];
         reader.onloadend = function(e) {
             function load_dec() {
-                if (--loaded === 0) platform.group_done(isgcode);
+                if (--loaded === 0) {
+                    platform.group_done(isgcode);
+                }
             }
             if (israw) {
                 platform.add(

src/kiri/widget.js

@@ -80,7 +80,8 @@ class Widget {
                 z: 0
             },
             top: 0, // z top
-            mirror: false
+            mirror: false,
+            indexed: false
         },
         // used to cache shadow geo
         this.cache = {};