Add "isFlying" JS field to Droid objects

doc/js-objects.md

@@ -95,6 +95,7 @@ the action directly, but it may be interesting to look at what it currently is.
 * ```experience``` Amount of experience this droid has, based on damage it has dealt to enemies.
 * ```cost``` What it would cost to build the droid. (3.2+ only)
 * ```isVTOL``` True if the droid is VTOL. (3.2+ only)
+* ```isFlying``` True if the droid is currently flying. (4.5.4+ only)
 * ```canHitAir``` True if the droid has anti-air capabilities. (3.2+ only)
 * ```canHitGround``` True if the droid has anti-ground capabilities. (3.2+ only)
 * ```isSensor``` True if the droid has sensor ability. (3.2+ only)

src/action.cpp

@@ -586,7 +586,7 @@ static bool actionRemoveDroidsFromBuildPos(unsigned player, Vector2i pos, uint16
 		}
 
 		Vector2i delta = map_coord(droid->pos.xy()) - b.map;
-		if (delta.x < 0 || delta.x >= b.size.x || delta.y < 0 || delta.y >= b.size.y || droid->isFlying())
+		if (delta.x < 0 || delta.x >= b.size.x || delta.y < 0 || delta.y >= b.size.y || droid->isFlying() || droid->isTransporter())
 		{
 			continue;  // Droid not under new structure (just near it).
 		}

src/combat.cpp

@@ -262,7 +262,7 @@ bool combFire(WEAPON *psWeap, BASE_OBJECT *psAttacker, BASE_OBJECT *psTarget, in
 		}
 
 		predict += Vector3i(iSinCosR(psDroid->sMove.moveDir, psDroid->sMove.speed * flightTime / GAME_TICKS_PER_SEC), 0);
-		if (!psDroid->isFlying())
+		if (!psDroid->isFlying() && !psDroid->isTransporter())
 		{
 			predict.z = map_Height(predict.xy());  // Predict that the object will be on the ground.
 		}

src/droid.cpp

@@ -2911,8 +2911,7 @@ bool DROID::isVtol() const
 /* returns true if the droid has lift propulsion and is moving */
 bool DROID::isFlying() const
 {
-	return getPropulsionStats()->propulsionType == PROPULSION_TYPE_LIFT
-		   && (sMove.Status != MOVEINACTIVE || isTransporter());
+	return getPropulsionStats()->propulsionType == PROPULSION_TYPE_LIFT && sMove.Status != MOVEINACTIVE;
 }
 
 // true if a droid is retreating for repair

src/move.cpp

@@ -897,7 +897,7 @@ static void moveOpenGates(DROID *psDroid, Vector2i tile)
 		return;
 	}
 	MAPTILE *psTile = mapTile(tile);
-	if (!psDroid->isFlying() && psTile && psTile->psObject && psTile->psObject->type == OBJ_STRUCTURE && aiCheckAlliances(psTile->psObject->player, psDroid->player))
+	if (!psDroid->isFlying() && !psDroid->isTransporter() && psTile && psTile->psObject && psTile->psObject->type == OBJ_STRUCTURE && aiCheckAlliances(psTile->psObject->player, psDroid->player))
 	{
 		requestOpenGate((STRUCTURE *)psTile->psObject);  // If it's a friendly gate, open it. (It would be impolite to open an enemy gate.)
 	}

src/projectile.cpp

@@ -892,7 +892,7 @@ static PROJECTILE* proj_InFlightFunc(PROJECTILE *psProj)
 		else if (!(psStats->surfaceToAir & SHOOT_ON_GROUND) &&
 		         (psTempObj->type == OBJ_STRUCTURE ||
 		          psTempObj->type == OBJ_FEATURE ||
-		          (psTempObj->type == OBJ_DROID && !((DROID*)psTempObj)->isFlying())
+		          (psTempObj->type == OBJ_DROID && !((DROID*)psTempObj)->isTransporter() && !((DROID*)psTempObj)->isFlying())
 		         ))
 		{
 			// AA weapons should not hit buildings and non-vtol droids

src/quickjs_backend.cpp

@@ -953,6 +953,7 @@ JSValue convFeature(const FEATURE *psFeature, JSContext *ctx)
 //;; * ```experience``` Amount of experience this droid has, based on damage it has dealt to enemies.
 //;; * ```cost``` What it would cost to build the droid. (3.2+ only)
 //;; * ```isVTOL``` True if the droid is VTOL. (3.2+ only)
+//;; * ```isFlying``` True if the droid is currently flying. (4.5.4+ only)
 //;; * ```canHitAir``` True if the droid has anti-air capabilities. (3.2+ only)
 //;; * ```canHitGround``` True if the droid has anti-ground capabilities. (3.2+ only)
 //;; * ```isSensor``` True if the droid has sensor ability. (3.2+ only)
@@ -1028,6 +1029,7 @@ JSValue convDroid(const DROID *psDroid, JSContext *ctx)
 	QuickJS_DefinePropertyValue(ctx, value, "canHitAir", JS_NewBool(ctx, aa), JS_PROP_ENUMERABLE);
 	QuickJS_DefinePropertyValue(ctx, value, "canHitGround", JS_NewBool(ctx, ga), JS_PROP_ENUMERABLE);
 	QuickJS_DefinePropertyValue(ctx, value, "isVTOL", JS_NewBool(ctx, psDroid->isVtol()), JS_PROP_ENUMERABLE);
+	QuickJS_DefinePropertyValue(ctx, value, "isFlying", JS_NewBool(ctx, psDroid->isFlying()), JS_PROP_ENUMERABLE);
 	QuickJS_DefinePropertyValue(ctx, value, "droidType", JS_NewInt32(ctx, (int)type), JS_PROP_ENUMERABLE);
 	QuickJS_DefinePropertyValue(ctx, value, "experience", JS_NewFloat64(ctx, (double)psDroid->experience / 65536.0), JS_PROP_ENUMERABLE);
 	QuickJS_DefinePropertyValue(ctx, value, "health", JS_NewFloat64(ctx, 100.0 / (double)psDroid->originalBody * (double)psDroid->body), JS_PROP_ENUMERABLE);