Quick View: avoid to lose focus when metadata button is clicked.

ui/file_manager/file_manager/foreground/elements/files_quick_view.js

Index: ui/file_manager/file_manager/foreground/elements/files_quick_view.js
diff --git a/ui/file_manager/file_manager/foreground/elements/files_quick_view.js b/ui/file_manager/file_manager/foreground/elements/files_quick_view.js
index 3fc8e6f922c1c42bfcb20de8f5b0ca6e65d67837..c7bab2f78610f12c7e59b3ea3a68b4750898456a 100644
--- a/ui/file_manager/file_manager/foreground/elements/files_quick_view.js
+++ b/ui/file_manager/file_manager/foreground/elements/files_quick_view.js
@@ -147,4 +147,16 @@ var FilesQuickView = Polymer({
     return !this.isImage_(type) && !this.isVideo_(type) && !this.isAudio_(type);
   },
 
+  ready: function() {
+    this.$['metadata-button'].addEventListener('click', function(e) {

[fukino, 2016/09/01 09:00:04]

I think adding "on-tap=" attribute for the metadata-button would be simpler.

[oka, 2016/09/01 09:35:47]

Done.

+      // Set focus back to innerContent panel if button is clicked by
+      // mouse or tap so that pressing space key after that closes Quick View.
+      if (e.screenX > 0 || e.screenY > 0) { // clicked by mouse or tap.

[fukino, 2016/09/01 09:00:04]

Can't we always focus the content panel on clicks? Is there a problem?

[oka, 2016/09/01 09:35:47]

Done.
I thought focus should be stick to the button if button is pressed by keyboard,
but moving focus to the main panel is consistent behaviour with the Files App's
button to toggle list view and thumbnail view.

+        e.stopPropagation();
+        e.preventDefault();
+        this.$.innerContentPanel.focus();
+      }
+    }.bind(this));
+  },
+
 });