Forward all motion events to mouse processors

The decision to not send motion events when no click is pressed is
specific to Android mouse injection. Other mouse processors (e.g. for
HID mouse) will need to receive all events.

app/src/input_manager.c

@@ -632,14 +632,6 @@ static void
 input_manager_process_mouse_motion(struct input_manager *im,
                                    const SDL_MouseMotionEvent *event) {
 
-    uint32_t mask = SDL_BUTTON_LMASK;
-    if (im->forward_all_clicks) {
-        mask |= SDL_BUTTON_MMASK | SDL_BUTTON_RMASK;
-    }
-    if (!(event->state & mask)) {
-        // do not send motion events when no click is pressed
-        return;
-    }
     if (event->which == SDL_TOUCH_MOUSEID) {
         // simulated from touch events, so it's a duplicate
         return;

app/src/mouse_inject.c

@@ -58,6 +58,11 @@ convert_touch_action(enum sc_touch_action action) {
 static void
 sc_mouse_processor_process_mouse_motion(struct sc_mouse_processor *mp,
                                     const struct sc_mouse_motion_event *event) {
+    if (!event->buttons_state) {
+        // Do not send motion events when no click is pressed
+        return;
+    }
+
     struct sc_mouse_inject *mi = DOWNCAST(mp);
 
     struct control_msg msg = {