gamescope mouse sensitivity <0 dead range fix

mouse_sense_fix.patch

diff --git a/src/wlserver.cpp b/src/wlserver.cpp
index 75fa37c6..20d64c8e 100644
--- a/src/wlserver.cpp
+++ b/src/wlserver.cpp
@@ -2753,6 +2753,16 @@ void wlserver_mousemotion( double dx, double dy, uint32_t time )
 
 	dx *= g_mouseSensitivity;
 	dy *= g_mouseSensitivity;
+	
+	static double rem_x = 0.0;
+	static double rem_y = 0.0;
+	dx += rem_x;
+	dy += rem_y;
+	rem_x = fmod(dx, 1.0);
+	rem_y = fmod(dy, 1.0);
+	dx -= rem_x;
+	dy -= rem_y;
+	if (abs(dx) <= 0 && abs(dy) <= 0) return;
 
 	wlserver_perform_rel_pointer_motion( dx, dy );
 

adapted from ValveSoftware/gamescope#1521 (comment)