[gzdoom-g2.1.pre-930-gbaa775b] mouse doesnt respond

[WaTaKiD]

since approx r900, when using in_mouse 2, opengl, (and mouse in menu disabled, in the newer builds), alt tabbing upon starting gzdoom will have the mouse not work in game until toggling in_mouse to something else

specs:
windows 7 ultimate 64 bit
gtx 670 with drivers 347.88
amd phenom ii x4 965 3.4 ghz quad core
16 gb ddr3 ram