Fix files-tooltip to consider RTL.

ui/file_manager/file_manager/foreground/elements/files_tooltip.js

Index: ui/file_manager/file_manager/foreground/elements/files_tooltip.js
diff --git a/ui/file_manager/file_manager/foreground/elements/files_tooltip.js b/ui/file_manager/file_manager/foreground/elements/files_tooltip.js
index cf1c727538d609c4fd1ff161b3684ad0eb8d4e69..cc7059f002cc52afdbf3153eb5ffb4a56ac77905 100644
--- a/ui/file_manager/file_manager/foreground/elements/files_tooltip.js
+++ b/ui/file_manager/file_manager/foreground/elements/files_tooltip.js
@@ -167,7 +167,9 @@ var FilesTooltip = Polymer({
     this.style.top = `${Math.round(top)}px`;
 
     var left = rect.left + rect.width / 2 - this.offsetWidth / 2;
-    if (left + this.offsetWidth > document.body.offsetWidth)
+    if (left < 0)
+      left = 0;
+    if (left > document.body.offsetWidth - this.offsetWidth)
       left = document.body.offsetWidth - this.offsetWidth;
     this.style.left = `${Math.round(left)}px`;