filterConditions property Null safety

Map<String, List<FilterCondition>> filterConditions

Holds the collection of FilterCondition based on the columns.

Here, key is the name of the column. Value is the collection of filter conditions.

Use DataGridSource.addFilterCondition and DataGridSource.removeFilterCondition to add or remove the filter conditions for columns.


Map<String, List<FilterCondition>> get filterConditions =>
    Map<String, List<FilterCondition>>.unmodifiable(_filterConditions);