try lint prefer_expression_function_bodies (#9494)

.analysis_options

diff --git a/.analysis_options b/.analysis_options
index fb8f2f7..4bd0213 100644
--- a/.analysis_options
+++ b/.analysis_options
@@ -94,7 +94,7 @@
     - prefer_collection_literals
     - prefer_const_constructors
     - prefer_contains
-    # - prefer_expression_function_bodies # not yet tested
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
     # - prefer_final_fields # https://github.com/dart-lang/linter/issues/506
     - prefer_final_locals
     # - prefer_function_declarations_over_variables # not yet tested

.analysis_options_repo

diff --git a/.analysis_options_repo b/.analysis_options_repo
index 01641fa..ef275a0 100644
--- a/.analysis_options_repo
+++ b/.analysis_options_repo
@@ -92,7 +92,7 @@
     - prefer_collection_literals
     - prefer_const_constructors
     - prefer_contains
-    # - prefer_expression_function_bodies # not yet tested
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
     # - prefer_final_fields # https://github.com/dart-lang/linter/issues/506
     - prefer_final_locals
     # - prefer_function_declarations_over_variables # not yet tested