UX: ensures popup-tip shows over dropdowns (#7891)

UX: ensures popup-tip shows over dropdowns (#7891)

diff --git a/app/assets/stylesheets/common/base/compose.scss b/app/assets/stylesheets/common/base/compose.scss
index 4c564bc..655290b 100644
--- a/app/assets/stylesheets/common/base/compose.scss
+++ b/app/assets/stylesheets/common/base/compose.scss
@@ -259,7 +259,7 @@
   }
 
   .popup-tip {
-    z-index: z("composer", "dropdown");
+    z-index: z("composer", "dropdown") + 1;
   }
 
   .wmd-controls {

GitHub sha: ff66e62e