rendersub: fix *very* occasional blinking subtitle text


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6409 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: removed an unused var in HBAdvancedController.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6410 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: hide the “Use advanced options panel” checkbox too when the advanced panel is disabled.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6411 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: realigned the prefs ui a bit.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6412 b64f7644-9d1e-0410-96f1-a4d463321fa5