0f4ca4c3fb
For the negative scrolling direction, RDP uses the two's complement, instead of the positive wheel value with the negative flag. xfreerdp currently uses the positive wheel value in addition to the negative flag, which results in a wrong wheel value on the server side (136 instead of 120). Fix this, by using the correct wheel rotation value, which is in the two's complement. (cherry picked from commit 1087a5e1a64cb591efb44b67cfa5a97a7f40aaf7)