ok, i do not see this, works fine here.
also my version of 1.0.12 is different:
1.0.12-1-4-ge6639d8, build date: 01/04/2017 12:37:59 CEST
can you redownload the released version of 1.012, and check the release number.
( i cant remember if it was updated due to a build issue or not, a long time ago)
windows 10 64 bit - 10.0.16299
java 8 151
im pretty sure im on the latest (or at least very recent) versions of everything, so id recommend you check you are up to date too.
@bigpig we do not support using the openjdk, only the official (oracle) java, so bugs reported there may not be relevant.
(and i don't think we want to move to the cross platform L&F , imho - it looks dreadful )