Improved video preview behavior

src/app/components/unified-file-card/unified-file-card.component.ts

@@ -36,6 +36,7 @@ export class UnifiedFileCardComponent implements OnInit {
   thumbnailBlobURL = null;
 
   streamURL = null;
+  hide_image = false;
 
   // input/output
   @Input() loading = true;
@@ -149,6 +150,20 @@ export class UnifiedFileCardComponent implements OnInit {
     return fullLocation;
   }
 
+  onMouseOver() {
+    this.elevated = true;
+    setTimeout(() => {
+      if (this.elevated) {
+        this.hide_image = true;
+      }
+    }, 500);
+  }
+
+  onMouseOut() {
+    this.elevated = false;
+    this.hide_image = false;
+  }
+
 }
 
 function fancyTimeFormat(time) {