fix #73863. no twisties in the outliner in classic. r=bienvenu, sr=alecf

themes/classic/global/mac/outliner.css

@@ -136,3 +136,16 @@ outlinercol:hover:active > .outlinercol-image-box
 {
   list-style-image: url("chrome://global/skin/columnselect.gif");
 }
+
+/* twisty rules */
+outlinerbody:-moz-outliner-twisty {
+  padding-right: 2px;
+  width: 12px; /* The image's width is 12 pixels */
+  list-style-image: url("chrome://global/skin/twisty-closed.gif");
+}
+  
+outlinerbody:-moz-outliner-twisty(open) {
+  width: 12px; /* The image's width is 12 pixels */
+  list-style-image: url("chrome://global/skin/twisty-open.gif");
+}
+

themes/classic/global/win/outliner.css

@@ -128,3 +128,16 @@ outlinercol:hover:active > .outlinercol-image-box {
 {
   list-style-image: url("chrome://global/skin/columnselect.gif");
 }
+
+/* twisty rules */
+outlinerbody:-moz-outliner-twisty {
+  padding-right: 2px;
+  width: 12px; /* The image's width is 12 pixels */
+  list-style-image: url("chrome://global/skin/twisty-closed.gif");
+}
+  
+outlinerbody:-moz-outliner-twisty(open) {
+  width: 12px; /* The image's width is 12 pixels */
+  list-style-image: url("chrome://global/skin/twisty-open.gif");
+}
+

themes/modern/global/outliner.css

@@ -161,4 +161,7 @@ outlinerbody:-moz-outliner-twisty {
 }
 
 outlinerbody:-moz-outliner-twisty(open) {
+  width: 10px; /* The image's width is 10 pixels */
   list-style-image: url("chrome://global/skin/tree/twisty-open.gif");
+}
+