first commit

wp-includes/js/tinymce/plugins/hr/plugin.js

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+(function () {
+var hr = (function () {
+    'use strict';
+
+    var global = tinymce.util.Tools.resolve('tinymce.PluginManager');
+
+    var register = function (editor) {
+      editor.addCommand('InsertHorizontalRule', function () {
+        editor.execCommand('mceInsertContent', false, '<hr />');
+      });
+    };
+    var Commands = { register: register };
+
+    var register$1 = function (editor) {
+      editor.addButton('hr', {
+        icon: 'hr',
+        tooltip: 'Horizontal line',
+        cmd: 'InsertHorizontalRule'
+      });
+      editor.addMenuItem('hr', {
+        icon: 'hr',
+        text: 'Horizontal line',
+        cmd: 'InsertHorizontalRule',
+        context: 'insert'
+      });
+    };
+    var Buttons = { register: register$1 };
+
+    global.add('hr', function (editor) {
+      Commands.register(editor);
+      Buttons.register(editor);
+    });
+    function Plugin () {
+    }
+
+    return Plugin;
+
+}());
+})();

wp-includes/js/tinymce/plugins/hr/plugin.min.js

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+!function(){"use strict";var n=tinymce.util.Tools.resolve("tinymce.PluginManager"),t=function(n){n.addCommand("InsertHorizontalRule",function(){n.execCommand("mceInsertContent",!1,"<hr />")})},o=function(n){n.addButton("hr",{icon:"hr",tooltip:"Horizontal line",cmd:"InsertHorizontalRule"}),n.addMenuItem("hr",{icon:"hr",text:"Horizontal line",cmd:"InsertHorizontalRule",context:"insert"})};n.add("hr",function(n){t(n),o(n)})}();