Fix box edit gizmo outside of image

For the moment I do it using a little hack.  I think if the gesture code
was better as soon as a drag gesture is one it should disable all the
other gestures.

src/box_edit.c

@@ -278,3 +278,8 @@ int box_edit(const float box[4][4], int mode, float transf[4][4])
 
     return g_data.gesture_state;
 }
+
+bool box_edit_is_active(void)
+{
+    return g_data.gesture_state;
+}

src/goxel.c

@@ -691,6 +691,7 @@ static int on_drag_rotate(const gesture_t *gest, void *user)
     float pos[3], normal[3];
     bool snap;
     if (gest->state == GESTURE_BEGIN) {
+        if (box_edit_is_active()) return 1; // XXX: to remve.
         snap = goxel_unproject(
             gest->viewport, gest->pos,
             SNAP_IMAGE_BOX | SNAP_SELECTION_OUT | SNAP_VOLUME,

src/goxel.h

@@ -654,6 +654,8 @@ int gox_iter_infos(const char *path,
  */
 int box_edit(const float box[4][4], int mode, float transf[4][4]);
 
+bool box_edit_is_active(void);
+
 
 void settings_load(void);
 void settings_save(void);