Administration: use shorthand css properties to improve readability

Consolidating `border`, `padding`, and `margin` instances where the shorthand can be used to improve readability.

Props ankitmaru, audrasjb, sabernhardt, mukesh27, hellofromTonya.
Fixes #52148.


Built from https://develop.svn.wordpress.org/trunk@50162


git-svn-id: http://core.svn.wordpress.org/trunk@49841 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/admin-menu-rtl.css

@@ -459,13 +459,12 @@ ul#adminmenu > li.current > a.current:after {
 /* flyout menu arrow */
 #adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after {
 	left: 0;
-	border: solid transparent;
+	border: 8px solid transparent;
 	content: " ";
 	height: 0;
 	width: 0;
 	position: absolute;
 	pointer-events: none;
-	border-width: 8px;
 	top: 10px;
 	z-index: 10000;
 }

wp-admin/css/admin-menu.css

@@ -458,13 +458,12 @@ ul#adminmenu > li.current > a.current:after {
 /* flyout menu arrow */
 #adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after {
 	right: 0;
-	border: solid transparent;
+	border: 8px solid transparent;
 	content: " ";
 	height: 0;
 	width: 0;
 	position: absolute;
 	pointer-events: none;
-	border-width: 8px;
 	top: 10px;
 	z-index: 10000;
 }

wp-admin/css/common-rtl.css

@@ -2701,9 +2701,8 @@ div.action-links {
 	right: 0;
 	margin-top: 10px;
 	margin-left: 250px; /* FYI box */
-	padding: 10px 26px;
+	padding: 10px 26px 99999px; /* equal height column trick */
 	margin-bottom: -99932px; /* 67px less than the padding below to accommodate footer height */
-	padding-bottom: 99999px; /* equal height column trick */
 }
 
 #section-holder .notice {
@@ -2719,9 +2718,8 @@ div.action-links {
 	position: relative;
 	top: 0;
 	left: 0;
-	padding: 16px;
+	padding: 16px 16px 99999px; /* equal height column trick */
 	margin-bottom: -99932px; /* 67px less than the padding below to accommodate footer height */
-	padding-bottom: 99999px; /* equal height column trick */
 	width: 217px;
 	border-right: 1px solid #dcdcde;
 	background: #f6f7f7;

wp-admin/css/common.css

@@ -2700,9 +2700,8 @@ div.action-links {
 	left: 0;
 	margin-top: 10px;
 	margin-right: 250px; /* FYI box */
-	padding: 10px 26px;
+	padding: 10px 26px 99999px; /* equal height column trick */
 	margin-bottom: -99932px; /* 67px less than the padding below to accommodate footer height */
-	padding-bottom: 99999px; /* equal height column trick */
 }
 
 #section-holder .notice {
@@ -2718,9 +2717,8 @@ div.action-links {
 	position: relative;
 	top: 0;
 	right: 0;
-	padding: 16px;
+	padding: 16px 16px 99999px; /* equal height column trick */
 	margin-bottom: -99932px; /* 67px less than the padding below to accommodate footer height */
-	padding-bottom: 99999px; /* equal height column trick */
 	width: 217px;
 	border-left: 1px solid #dcdcde;
 	background: #f6f7f7;

wp-admin/css/customize-controls-rtl.css

@@ -2369,8 +2369,7 @@ body.cheatin h1 {
 	font-size: 24px;
 	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
 	margin: 30px 0 0 0;
-	padding: 0;
-	padding-bottom: 7px;
+	padding: 0 0 7px;
 }
 
 body.cheatin p {
@@ -2388,8 +2387,7 @@ body.cheatin p {
 #customize-theme-controls .add-new-menu-item {
 	cursor: pointer;
 	float: left;
-	margin: 0;
-	margin-right: 10px;
+	margin: 0 10px 0 0;
 	transition: all 0.2s;
 	-webkit-user-select: none;
 	-ms-user-select: none;

wp-admin/css/customize-controls.css

@@ -2368,8 +2368,7 @@ body.cheatin h1 {
 	font-size: 24px;
 	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
 	margin: 30px 0 0 0;
-	padding: 0;
-	padding-bottom: 7px;
+	padding: 0 0 7px;
 }
 
 body.cheatin p {
@@ -2387,8 +2386,7 @@ body.cheatin p {
 #customize-theme-controls .add-new-menu-item {
 	cursor: pointer;
 	float: right;
-	margin: 0;
-	margin-left: 10px;
+	margin: 0 0 0 10px;
 	transition: all 0.2s;
 	-webkit-user-select: none;
 	-ms-user-select: none;

wp-admin/css/edit-rtl.css

@@ -1851,10 +1851,7 @@ table.links-table {
 	}
 
 	.wp_themeSkin .mceSplitButton td a.mceAction {
-		padding-top: 6px;
-		padding-bottom: 6px;
-		padding-right: 6px;
-		padding-left: 3px;
+		padding: 6px 6px 6px 3px;
 	}
 
 	.wp_themeSkin .mceSplitButton td a.mceOpen,

wp-admin/css/edit.css

@@ -1850,10 +1850,7 @@ table.links-table {
 	}
 
 	.wp_themeSkin .mceSplitButton td a.mceAction {
-		padding-top: 6px;
-		padding-bottom: 6px;
-		padding-left: 6px;
-		padding-right: 3px;
+		padding: 6px 3px 6px 6px;
 	}
 
 	.wp_themeSkin .mceSplitButton td a.mceOpen,

wp-admin/css/install-rtl.css

@@ -37,8 +37,7 @@ h1, h2 {
 	clear: both;
 	color: #646970;
 	font-size: 24px;
-	padding: 0;
-	padding-bottom: 7px;
+	padding: 0 0 7px;
 	font-weight: 400;
 }
 

wp-admin/css/install.css

@@ -36,8 +36,7 @@ h1, h2 {
 	clear: both;
 	color: #646970;
 	font-size: 24px;
-	padding: 0;
-	padding-bottom: 7px;
+	padding: 0 0 7px;
 	font-weight: 400;
 }