FIX: rtl topic progress wrapper position (#7070)

* Set left/right topic-progress-wrapper CSS from text-direction

* Remove unnecessary CSS rule

app/assets/javascripts/discourse/components/topic-progress.js.es6

@@ -155,14 +155,16 @@ export default Ember.Component.extend({
     const $wrapper = this.$();
     if (!$wrapper || $wrapper.length === 0) return;
 
-    const offset = window.pageYOffset || $("html").scrollTop(),
+    const $html = $("html"),
+      offset = window.pageYOffset || $html.scrollTop(),
       progressHeight = this.site.mobileView ? 0 : $("#topic-progress").height(),
       maximumOffset = $("#topic-bottom").offset().top + progressHeight,
       windowHeight = $(window).height(),
       bodyHeight = $("body").height(),
       composerHeight = $("#reply-control").height() || 0,
       isDocked = offset >= maximumOffset - windowHeight + composerHeight,
-      bottom = bodyHeight - maximumOffset;
+      bottom = bodyHeight - maximumOffset,
+      wrapperDir = $html.hasClass("rtl") ? "left" : "right";
 
     if (composerHeight > 0) {
       $wrapper.css("bottom", isDocked ? bottom : composerHeight);
@@ -174,9 +176,9 @@ export default Ember.Component.extend({
 
     const $replyArea = $("#reply-control .reply-area");
     if ($replyArea && $replyArea.length > 0) {
-      $wrapper.css("right", `${$replyArea.offset().left}px`);
+      $wrapper.css(wrapperDir, `${$replyArea.offset().left}px`);
     } else {
-      $wrapper.css("right", "1em");
+      $wrapper.css(wrapperDir, "1em");
     }
 
     // switch mobile scroll logo at the very bottom of topics

app/assets/stylesheets/common/base/rtl.scss

@@ -2,11 +2,6 @@
 // *** These styles are all going to be flipped by the r2 gem ***
 // Adding the !important declaration to a rule prevents it from being flipped.
 
-.rtl #topic-progress-wrapper .topic-admin-popup-menu.right-side,
-.rtl #topic-progress-wrapper.docked .topic-admin-popup-menu.right-side {
-  right: 80px;
-}
-
 // This is used to flip the .d-icon-caret-right
 @mixin rotate($degrees) {
   -webkit-transform: rotate(#{$degrees}deg);