Bug 1377929 - Remove button-hover-effect of composer's From: label. r=jorgk

mail/themes/linux/mail/compose/messengercompose.css

@@ -427,23 +427,6 @@ treechildren::-moz-tree-image(subscribed-news) {
   padding-top: 3px;
 }
 
-#identityLabel {
-  -moz-appearance: none;
-  margin-inline-end: 3px;
-  margin-top: 2px;
-  margin-bottom: 0;
-  padding: 3px 5px;
-  color: ButtonText;
-  background-color: transparent;
-  border: 1px solid transparent;
-  transition: background-color .25s ease-in;
-}
-
-#identityLabel:hover {
-  border-color: rgba(125, 125, 125, .4);
-  background-color: rgba(125, 125, 125, .4);
-}
-
 #msgIdentity {
   -moz-appearance: none;
   -moz-box-align: center;

mail/themes/osx/mail/compose/messengercompose.css

@@ -233,21 +233,6 @@ toolbar[brighttext] #button-print {
   border-bottom: 0px solid;
 }
 
-#identityLabel {
-  margin: 1px 0;
-  margin-inline-end: 4px;
-  padding: 1px;
-  background-color: transparent;
-  border: 1px solid transparent;
-  border-radius: 2px;
-  transition: background-color .25s ease-in;
-}
-
-#identityLabel:hover {
-  background-color: rgba(150, 150, 150, .4);
-  border-color: rgba(149, 165, 166, 0.3);
-}
-
 #msgIdentity {
   margin: 0;
   margin-inline-end: 1px;

mail/themes/windows/mail/compose/messengercompose.css

@@ -115,19 +115,6 @@
   margin-top: 2px;
 }
 
-#identityLabel {
-  -moz-appearance: none;
-  border: 1px solid transparent;
-  margin-bottom: 1px;
-  margin-inline-end: 0;
-  padding: 3px 4px 2px;
-  transition: border .2s, background-color .2s;
-}
-
-#identityLabel > .toolbarbutton-icon {
-  display: none;
-}
-
 #msgSubject {
   -moz-appearance: none;
   margin-top: 0;
@@ -891,13 +878,11 @@ treechildren::-moz-tree-image(subscribed-news) {
     transition-duration: 150ms;
   }
 
-  #identityLabel:hover,
   menulist:not([disabled="true"]):not([open="true"]):hover {
     background: var(--toolbarbutton-active-background);
     border-color: var(--toolbarbutton-active-bordercolor);
   }
 
-  #identityLabel:hover:active,
   menulist[open="true"] {
     background: var(--toolbarbutton-active-background);
     border-color: var(--toolbarbutton-active-bordercolor);
@@ -1003,12 +988,10 @@ treechildren::-moz-tree-image(subscribed-news) {
     background-color: #eef3fa;
   }
 
-  #identityLabel,
   menulist {
     border-radius: 2px;
   }
 
-  #identityLabel:hover:active,
   menulist[open="true"] {
     text-shadow: none;
     transition: none;