Prevent unintended side-effects of filter functions

Author: tarleb

src/resources/filters/normalize/flags.lua

@@ -107,8 +107,7 @@ function compute_flags()
         -- FIXME: are we actually triggering this with FloatRefTargets?
         -- table captions
         local kTblCap = "tbl-cap"
-        local tblCap = extractTblCapAttrib(node,kTblCap)
-        if hasTableRef(node) or tblCap then
+        if hasTableRef(node) or node.attr.attributes[kTblCap] then
           flags.has_table_captions = true
         end
 

src/resources/filters/quarto-pre/table-captions.lua

@@ -231,7 +231,7 @@ function extractTblCapAttrib(el, name, subcap)
     else
       value = pandoc.List({ value })
     end
-    el.attr.attributes[name] = nil
+    -- el.attr.attributes[name] = nil
     return value
   end
   return nil