Make sure errorText set in decoration not ignored

Author: danvick

lib/src/fields/form_builder_checkbox_group.dart

@@ -59,7 +59,7 @@ class FormBuilderCheckboxGroup<T> extends FormBuilderField<List<T>> {
             return InputDecorator(
               decoration: decoration.copyWith(
                 enabled: !state.readOnly,
-                errorText: field.errorText,
+                errorText: decoration?.errorText ?? field.errorText,
               ),
               child: GroupedCheckbox(
                 orientation: orientation,

lib/src/fields/form_builder_checkbox_list.dart

@@ -79,7 +79,7 @@ class FormBuilderCheckboxList<T> extends FormBuilderField<List<T>> {
             return InputDecorator(
               decoration: decoration.copyWith(
                 enabled: !state.readOnly,
-                errorText: field.errorText,
+                errorText: decoration?.errorText ?? field.errorText,
               ),
               child: Column(
                 key: ObjectKey(state.value),

lib/src/fields/form_builder_dropdown.dart

@@ -76,7 +76,7 @@ class FormBuilderDropdown<T> extends FormBuilderField<T> {
               return InputDecorator(
                 decoration: decoration.copyWith(
                   enabled: !state.readOnly,
-                  errorText: field.errorText,
+                  errorText: decoration?.errorText ?? field.errorText,
                   floatingLabelBehavior: hint == null
                       ? decoration.floatingLabelBehavior
                       : FloatingLabelBehavior.always,