Change max-height of all dropdowns to 312px

app/assets/stylesheets/framework/dropdowns.scss

@@ -28,7 +28,9 @@
   .dropdown-menu,
   .dropdown-menu-nav {
     @include set-visible;
-    min-height: 40px;
+    min-height: $dropdown-min-height;
+    max-height: $dropdown-max-height;
+    overflow: auto;
     @media (max-width: $screen-xs-max) {
       width: 100%;

app/assets/stylesheets/framework/filters.scss

@@ -260,7 +260,7 @@
 }
 .filtered-search-input-dropdown-menu {
-  max-height: 260px;
+  max-height: $dropdown-max-height;
   max-width: 280px;
   overflow: auto;

app/assets/stylesheets/framework/variables.scss

@@ -334,7 +334,8 @@ $regular_font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-San
 * Dropdowns
 */
 $dropdown-width: 300px;
-$dropdown-max-height: 215px;
+$dropdown-min-height: 40px;
+$dropdown-max-height: 312px;
 $dropdown-vertical-offset: 4px;
 $dropdown-link-color: #555;
 $dropdown-link-hover-bg: $row-hover;

app/assets/stylesheets/pages/pipelines.scss

@@ -48,7 +48,7 @@
       }
       .dropdown-menu {
-        max-height: 250px;
+        max-height: $dropdown-max-height;
         overflow-y: auto;
       }

app/assets/stylesheets/pages/projects.scss

@@ -322,13 +322,6 @@
   }
 }
-.project-repo-buttons {
-  .project-action-button .dropdown-menu {
-    max-height: 250px;
-    overflow-y: auto;
-  }
-}
-
 .split-one {
   display: inline-table;
   margin-right: 12px;