Don't warp mouse on focus lost.

This isn't working great, so undo it until we can fix it properly to save /
restore mouse positions.

--HG--
extra : histedit_source : d8fe81a1690bd9406df132c325c8dd7c61baec29%2C2243b548ccaec444b2e4bdab04ba67cdf236c4fb
Mac: Don't supress mousemoves after warp.

By default, synthesizing events supresses real events for a quarter
second. This makes for some wonky behavior.

--HG--
extra : histedit_source : 769156e3eba77c601de006c5aad1cdc1febe1d6c
Mac: Fix relative mode message after gaining focus.

This fixes a bug where relative mode would give a large jump if the
cursor was moved when the app doesn't have focus.

--HG--
extra : histedit_source : ff1b20a9e7f6e079c073c4ef761566b6c80b0f22%2C9879c6c838c69afea4aa2be80cbe137054600d12