Adding appendChild fix for GWT game input, to see if it works in Safari.

html/src/main/java/com/agifans/agile/gwt/GwtDialogHandler.java

@@ -280,8 +280,12 @@ private final native void showHtmlOpenFileDialog(String type, GwtOpenFileResults
         
         console.log('Finished creating input element of type file');
         
+        document.body.appendChild(fileInputElem);
+        
         // The change event occurs after a file is chosen.
         fileInputElem.addEventListener("change", function(event) {
+            document.body.removeChild(fileInputElem);
+        
             if (this.files.length === 0) {
                 console.log('No files selected for import');
             
@@ -319,6 +323,15 @@ private final native void showHtmlOpenFileDialog(String type, GwtOpenFileResults
             }
         });
         
+        fileInputElem.addEventListener("cancel", function(event) {
+            document.body.removeChild(fileInputElem);
+            
+            console.log('Open file dialog was cancelled.');
+            
+            // No file was selected, so nothing more to do.
+            [email protected]::onFileResultsReady([Lcom/agifans/agile/gwt/GwtOpenFileResult;)([]);
+        });
+        
         // Trigger the display of the open file dialog.
         fileInputElem.click();