Add -moz-image-region:auto to cut off inheritance where needed (and not previously noticed due to an inheritance bug with -moz-image-region). b=220717 r=bzbarsky sr=ben

themes/classic/global/mac/toolbarbutton.css

@@ -175,6 +175,7 @@ toolbarbutton[type="menu-button"][open="true"] > .toolbarbutton-menubutton-dropm
   -moz-box-align: center;
   padding: 0 0 1px 0;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.gif");
+  -moz-image-region: auto; /* cut off inheritance */
 }
 
 .toolbarbutton-menubutton-dropmarker[disabled="true"] {

themes/classic/global/unix/toolbarbutton.css

@@ -172,6 +172,7 @@ toolbarbutton[type="menu-button"][open="true"] > .toolbarbutton-menubutton-dropm
   -moz-box-align: center;
   padding: 0 0 1px 0;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.gif");
+  -moz-image-region: auto; /* cut off inheritance */
   -moz-appearance: dualbutton-dropdown;
 }
 

themes/classic/global/win/toolbarbutton.css

@@ -173,6 +173,7 @@ toolbarbutton[type="menu-button"][open="true"] > .toolbarbutton-menubutton-dropm
   -moz-box-align: center;
   padding: 0 0 1px 0;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.gif");
+  -moz-image-region: auto; /* cut off inheritance */
 }
 
 .toolbarbutton-menubutton-dropmarker[disabled="true"] {

themes/modern/global/toolbarbutton.css

@@ -127,6 +127,7 @@ toolbarbutton[checked="true"]:hover:active {
   width: 13px;
   height: 11px;
   list-style-image: url("chrome://global/skin/button/tbmbtn-arrow.gif");
+  -moz-image-region: auto; /* cut off inheritance */
 }
 
 toolbarbutton:hover > stack > .toolbarbutton-menubutton-dropmarker {

toolkit/skin/mac/toolbarbutton.css

@@ -116,8 +116,9 @@ toolbarbutton[type="menu-button"][disabled="true"]:hover:active {
   -moz-box-align: center;
   -moz-box-pack: center;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.png");
+  -moz-image-region: auto; /* cut off inheritance */
 }
 
 .toolbarbutton-menubutton-dropmarker[disabled="true"] {
   list-style-image: url("chrome://global/skin/arrow/arrow-dn-dis.png") !important;
-}
+}

toolkit/skin/unix/toolbarbutton.css

@@ -172,6 +172,7 @@ toolbarbutton[type="menu-button"][open="true"] > .toolbarbutton-menubutton-dropm
   -moz-box-align: center;
   padding: 0 0 1px 0;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.gif");
+  -moz-image-region: auto; /* cut off inheritance */
   -moz-appearance: dualbutton-dropdown;
 }
 

toolkit/skin/win/toolbarbutton.css

@@ -118,6 +118,7 @@ toolbarbutton[type="menu-button"][disabled="true"]:hover:active {
   -moz-box-align: center;
   padding: 0 0 1px 0;
   list-style-image: url("chrome://global/skin/arrow/arrow-dn.gif");
+  -moz-image-region: auto; /* cut off inheritance */
 }
 
 .toolbarbutton-menubutton-dropmarker[disabled="true"] {