Bug 1296361 - Implement shadow behind arrow panels across platforms. r=mdeboer

toolkit/themes/linux/global/popup.css

@@ -21,14 +21,14 @@ panel[type="arrow"] {
 
 panel[type="arrow"][side="top"],
 panel[type="arrow"][side="bottom"] {
-  margin-left: -16px;
-  margin-right: -16px;
+  margin-left: -20px;
+  margin-right: -20px;
 }
 
 panel[type="arrow"][side="left"],
 panel[type="arrow"][side="right"] {
-  margin-top: -16px;
-  margin-bottom: -16px;
+  margin-top: -20px;
+  margin-bottom: -20px;
 }
 
 .panel-arrowcontent {
@@ -36,6 +36,8 @@ panel[type="arrow"][side="right"] {
   color: var(--panel-arrowcontent-color);
   background: var(--panel-arrowcontent-background);
   border: 1px solid var(--panel-arrowcontent-border-color);
+  box-shadow: 0 0 4px hsla(0,0%,0%,.2);
+  margin: 4px;
 }
 
 .panel-arrow[side="top"],
@@ -43,34 +45,34 @@ panel[type="arrow"][side="right"] {
   list-style-image: var(--panel-arrow-image-vertical,
                         url("chrome://global/skin/arrow/panelarrow-vertical-themed.svg"));
   position: relative;
-  margin-left: 6px;
-  margin-right: 6px;
+  margin-left: 10px;
+  margin-right: 10px;
 }
 
 .panel-arrow[side="top"] {
-  margin-bottom: -1px;
+  margin-bottom: -5px;
 }
 
 .panel-arrow[side="bottom"] {
   transform: scaleY(-1);
-  margin-top: -1px;
+  margin-top: -5px;
 }
 
 .panel-arrow[side="left"],
 .panel-arrow[side="right"] {
   list-style-image: url("chrome://global/skin/arrow/panelarrow-horizontal-themed.svg");
   position: relative;
-  margin-top: 6px;
-  margin-bottom: 6px;
+  margin-top: 10px;
+  margin-bottom: 10px;
 }
 
 .panel-arrow[side="left"] {
-  margin-right: -1px;
+  margin-right: -5px;
 }
 
 .panel-arrow[side="right"] {
   transform: scaleX(-1);
-  margin-left: -1px;
+  margin-left: -5px;
 }
 
 /* ::::: tooltip ::::: */

toolkit/themes/windows/global/popup.css

@@ -53,6 +53,7 @@ panel[type="arrow"][side="right"] {
   background: var(--panel-arrowcontent-background);
   background-clip: padding-box;
   border: 1px solid var(--panel-arrowcontent-border-color);
+  box-shadow: 0 0 4px hsla(0,0%,0%,.2);
   margin: 4px;
 }