Files.app: Make selected grid items gray when the grid is not focused.

ui/file_manager/file_manager/foreground/css/file_manager.css

Index: ui/file_manager/file_manager/foreground/css/file_manager.css
diff --git a/ui/file_manager/file_manager/foreground/css/file_manager.css b/ui/file_manager/file_manager/foreground/css/file_manager.css
index ff5f158ba358fe91fcb9b3df8bf5b7bfa2d7f847..d30d1cbb6dbff8ab73bbcb03c64c42b34bddeafd 100644
--- a/ui/file_manager/file_manager/foreground/css/file_manager.css
+++ b/ui/file_manager/file_manager/foreground/css/file_manager.css
@@ -1130,7 +1130,7 @@ body.check-select .thumbnail-grid .thumbnail-item[selected] .checkmark.active {
 }
 
 .thumbnail-grid .shield {
-  background-color: rgba(27, 168, 243, 0.5);
+  background-color: rgba(160, 160, 160, 0.5);
   bottom: 0;
   display: none;
   left: 0;
@@ -1139,6 +1139,10 @@ body.check-select .thumbnail-grid .thumbnail-item[selected] .checkmark.active {
   top: 0;
 }
 
+.thumbnail-grid:focus .shield {
+  background-color: rgba(27, 168, 243, 0.5);
+}
+
 .thumbnail-grid .thumbnail-item[selected] .shield {
   display: block;
 }
@@ -1154,6 +1158,10 @@ body.check-select .thumbnail-grid .thumbnail-item[selected] .checkmark.active {
 }
 
 .thumbnail-grid .thumbnail-item[selected].directory .thumbnail-bottom {
+  background-color: rgb(232, 232, 232);
+}
+
+.thumbnail-grid:focus .thumbnail-item[selected].directory .thumbnail-bottom {
   background-color: rgb(232, 246, 253);
 }