d016b8ba48
-I introduced some weird bug making lines appear on the screen when drawing outside the limits of the zoom in zoom mode. Seems there is a XOR line function that get called with negative coordinates -The preview rectangle is drawn with XOR-lines on the screen and does not modify the picture. So it is possible to erase it in the zoom screen by moving the cursor around it. -Maybe I missed some testcases, i did not manage to reproduce the problem trigerred by grid clipping, for one. -The gradiation vector is horizontal when it should be inclined. I probably missed something when writing the code for it. Probably a division gets out of precision... i should check if i used floats where needed git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@339 416bcca6-2ee7-4201-b75f-2eb2f807beb1
