[[ Bug 20882 ]] Ensure pi editors can control multiple props

Previously the value for each prop in a mutiprop editor was being
put into an incorrect array key- from the editors point of view
the property name is `prop1;prop2`, and the value ought to be an
array with keys `prop1` and `prop2`

Author: livecodeali

Toolset/libraries/revidelibrary.8.livecodescript

@@ -1322,7 +1322,7 @@ on __readGroupedPropertiesOfControl pGroupsA, @pDataA
    repeat for each key tKey in tPropMappingA
       if the number of items in tKey > 1 then
          repeat for each item tRealProp in tKey
-            __fetchPropertyOfControl tRealProp, tDataA[tRealProp]
+            __fetchPropertyOfControl tRealProp, tDataA[tKey]
          end repeat
       else
          __fetchPropertyOfControl tKey, tDataA

notes/bugfix-20882.md

@@ -0,0 +1 @@
+# Ensure PI editors can control multiple props