Make affix accept `0` as offsetTop or offsetBottom

Fixes #12815.
Closes #14363.

diff --git a/js/affix.js b/js/affix.js
index bd48fc2ca3eb73418d76dea348829a43e9c3febb..b8519ecb3476699e6fa93665968fbab7b1344d85 100644 (file)
--- a/js/affix.js
+++ b/js/affix.js
@@ -152,8 +152,8 @@
 
       data.offset = data.offset || {}
 
-      if (data.offsetBottom) data.offset.bottom = data.offsetBottom
-      if (data.offsetTop)    data.offset.top    = data.offsetTop
+      if (data.offsetBottom != null) data.offset.bottom = data.offsetBottom
+      if (data.offsetTop    != null) data.offset.top    = data.offsetTop
 
       Plugin.call($spy, data)
     })