The recursivity of normalizeData method in TreeGrid class is potentially endless with only-numbers string as key and parentKey #31
Description
The problem:
If the values of keyColumnName and parentColumnName fields are strings with only numeric character, the recursivity of normalizeData method in TreeGrid class is potentially endless.
Example case:
For example, if we have the follow data (informal code):
Node1: [key = "1", parentKey = null]
Node2: [key = "01", parentKey = "1"]
Node3: [key = "001", parentKey = "01"]
When is searching then Node2's children (value of $parentId parameter is "01"), because Node2's parentKey is "1", the condition ArrayHelper::getValue($element, $this->parentColumnName) == $parentId is evaluated true, therefore a new call to normalizeData is thrown to search (again) the Node2's children.
Suggested modification:
Use the type-strict comparation operator (===) instead the double equal operator (==).
ArrayHelper::getValue($element, $this->parentColumnName) === $parentId