fix thread safety of ft new face and ft done face

8 jobs for thread_safe_new_done_face in 10 minutes and 28 seconds (queued for 10 seconds)
latest
Status Job ID Name Coverage
  Build
passed #7083171
build

00:05:55

passed #7083176
build_android

00:01:11

passed #7083172
build_clang_libcpp

00:04:57

passed #7083478
build_clazy

00:04:18

passed #7083174
build_mingw64_fedora

00:03:21

passed #7083173
build_ubuntu_16_04

00:01:50

passed #7083170
clang_format

00:01:02

failed #7083175
build_clazy

00:04:49