Allow research even if sector was attacked after capture

core/src/mindustry/game/Objectives.java

@@ -59,7 +59,7 @@ public class Objectives{
 
         @Override
         public boolean complete(){
-            return preset.sector.save != null && !preset.sector.isAttacked() && preset.sector.hasBase();
+            return preset.sector.save != null && (!preset.sector.isAttacked() || preset.sector.info.wasCaptured) && preset.sector.hasBase();
         }
 
         @Override

core/src/mindustry/game/SectorInfo.java

@@ -33,6 +33,8 @@ public class SectorInfo{
     public int storageCapacity = 0;
     /** Whether a core is available here. */
     public boolean hasCore = true;
+    /** Whether this sector was ever fully captured. */
+    public boolean wasCaptured = false;
     /** Sector that was launched from. */
     public @Nullable Sector origin;
     /** Launch destination. */

core/src/mindustry/game/Universe.java

@@ -180,6 +180,7 @@ public class Universe{
                         }else if(attacked && wavesPassed > 0 && sector.info.winWave > 1 && sector.info.wave + wavesPassed >= sector.info.winWave && !sector.hasEnemyBase()){
                             //autocapture the sector
                             sector.info.waves = false;
+                            sector.info.wasCaptured = true;
 
                             //fire the event
                             Events.fire(new SectorCaptureEvent(sector));