Issue #1608878 follow-up by tim.plunkett: Move Dropbutton CSS to dropbutton.base.css from node.admin.css.

core/misc/dropbutton/dropbutton.base-rtl.css

@@ -7,6 +7,10 @@
 /**
  * The dropbutton arrow.
  */
+.dropbutton-widget {
+  left: 0;
+  right: auto;
+}
 .dropbutton-toggle {
   left: 0;
   right: auto;

core/misc/dropbutton/dropbutton.base.css

@@ -14,10 +14,17 @@
   box-sizing: border-box;
 }
 .dropbutton-wrapper {
-  display: inline-block;
+  display: block;
+  min-height: 2em;
+  position: relative;
 }
 .dropbutton-widget {
-  position: relative;
+  position: absolute;
+  right: 0; /* LTR */
+}
+.dropbutton-wrapper,
+.dropbutton-widget {
+  max-width: 100%;
 }
 /* UL styles are over-scoped in core, so this selector needs weight parity. */
 .dropbutton-widget .dropbutton {
@@ -44,6 +51,13 @@
 .dropbutton-multiple .dropbutton-widget {
   padding-right: 2em; /* LTR */
 }
+.dropbutton-multiple.open,
+.dropbutton-multiple.open .dropbutton-widget {
+  max-width: none;
+}
+.dropbutton-multiple.open {
+  z-index: 100;
+}
 .dropbutton-multiple .dropbutton .secondary-action {
   display: none;
 }

core/modules/node/node.admin-rtl.css

@@ -1,7 +0,0 @@
-/**
- * Operations dropbuttons
- */
-.dropbutton-widget {
-  left: 0;
-  right: auto;
-}

core/modules/node/node.admin.css

@@ -9,27 +9,3 @@
 .revision-current {
   background: #ffc;
 }
-
-/**
- * Operations dropbuttons
- */
-.dropbutton-wrapper {
-  display: block;
-  min-height: 2em;
-  position: relative;
-}
-.dropbutton-widget {
-  position: absolute;
-  right: 0; /* LTR */
-}
-.dropbutton-wrapper,
-.dropbutton-widget {
-  max-width: 100%;
-}
-.dropbutton-multiple.open,
-.dropbutton-multiple.open .dropbutton-widget {
-  max-width: none;
-}
-.dropbutton-multiple.open {
-  z-index: 100;
-}