fix logic for autotrain and autotrade

docs/changelog.txt

@@ -38,6 +38,8 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 
 ## Fixes
 - Fix extra keys appearing in DFHack text boxes when shift (or any other modifier) is released before the other key you were pressing
+- `logistics`: don't autotrain domestic animals brought by invaders (they'll get attacked by friendly creatures as soon as you let them out of their cage)
+- `logistics`: don't bring trade goods to depot if the only caravans present are tribute caravans
 
 ## Misc Improvements
 - `stockpiles`: include exotic pets in the "tameable" filter

plugins/logistics.cpp

@@ -330,11 +330,13 @@ private:
     df::building_tradedepotst * const depot;
 
     static df::building_tradedepotst * get_active_trade_depot() {
-        // at least one caravan must be approaching or ready to trade
+        // at least one non-tribute caravan must be approaching or ready to trade
         if (!plotinfo->caravans.size())
             return NULL;
         bool found = false;
         for (auto caravan : plotinfo->caravans) {
+            if (caravan->flags.bits.tribute)
+                continue;
             auto trade_state = caravan->trade_state;
             auto time_remaining = caravan->time_remaining;
             if ((trade_state == df::caravan_state::T_trade_state::Approaching ||
@@ -392,8 +394,9 @@ public:
 
     bool can_designate(color_ostream& out, df::item* item) override {
         auto unit = get_caged_unit(item);
-        return unit && Units::isTamable(unit) && !Units::isTame(unit)
-            && !has_training_assignment(unit);
+        return unit && !Units::isInvader(unit) &&
+            Units::isTamable(unit) && !Units::isTame(unit) &&
+            !has_training_assignment(unit);
     }
 
     bool designate(color_ostream& out, df::item* item) override {