Correctly manage mouse relative motion

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401270

src/video/gem/SDL_gemevents.c

@@ -382,13 +382,13 @@ static void do_mouse(_THIS, short mx, short my, short mb, short ks)
 	}
 
 	/* Mouse motion ? */
-	if ((prevmousex!=mx) || (prevmousey!=my)) {
 	if (GEM_mouse_relative) {
-			if ((SDL_AtariXbios_mousex!=0) || (SDL_AtariXbios_mousey!=0)) {
+		if (SDL_AtariXbios_mousex || SDL_AtariXbios_mousey) {
 			SDL_PrivateMouseMotion(0, 1, SDL_AtariXbios_mousex, SDL_AtariXbios_mousey);
 			SDL_AtariXbios_mousex = SDL_AtariXbios_mousey = 0;
 		}
 	} else {
+		if ((prevmousex!=mx) || (prevmousey!=my)) {
 			int posx, posy;
 
 			/* Give mouse position relative to window position */

src/video/gem/SDL_gemmouse.c

@@ -165,8 +165,8 @@ void GEM_WarpWMCursor(_THIS, Uint16 x, Uint16 y)
 void GEM_CheckMouseMode(_THIS)
 {
 	/* If the mouse is hidden and input is grabbed, we use relative mode */
-	if ( !(SDL_cursorstate & CURSOR_VISIBLE) &&
-		(this->input_grab != SDL_GRAB_OFF) &&
+	if ( (!(SDL_cursorstate & CURSOR_VISIBLE)) &&
+		/*(this->input_grab != SDL_GRAB_OFF) && */ /* Damn GEM can not grab */
              (SDL_GetAppState() & SDL_APPACTIVE) ) {
 		GEM_mouse_relative = SDL_TRUE;
 	} else {