convert choreo record into morph GA uses on send

lib/pages/chat/chat.dart

@@ -683,11 +683,18 @@ class ChatController extends State<ChatPageWithRoom>
             AnalyticsStream(
               eventId: msgEventId,
               roomId: room.id,
-              constructs: originalSent!.vocabUses(
-                choreo: choreo,
-                tokens: tokensSent!.tokens,
-                metadata: metadata,
-              ),
+              constructs: [
+                ...originalSent!.vocabUses(
+                  choreo: choreo,
+                  tokens: tokensSent!.tokens,
+                  metadata: metadata,
+                ),
+                ...originalSent.morphConstructUses(
+                  choreo: choreo,
+                  tokens: tokensSent.tokens,
+                  metadata: metadata,
+                ),
+              ],
               origin: AnalyticsUpdateOrigin.sendMessage,
             ),
           );

lib/pangea/enum/construct_use_type_enum.dart

@@ -100,7 +100,6 @@ extension ConstructUseTypeExtension on ConstructUseTypeEnum {
       case ConstructUseTypeEnum.corWL:
         return 3;
 
-      case ConstructUseTypeEnum.ga:
       case ConstructUseTypeEnum.corIGC:
         return 2;
 
@@ -115,6 +114,9 @@ extension ConstructUseTypeExtension on ConstructUseTypeEnum {
       case ConstructUseTypeEnum.nan:
         return 0;
 
+      case ConstructUseTypeEnum.ga:
+        return -1;
+
       case ConstructUseTypeEnum.incIt:
       case ConstructUseTypeEnum.incIGC:
         return -2;

lib/pangea/models/pangea_match_model.dart

@@ -108,7 +108,7 @@ class PangeaMatch {
   }
 
   bool isOffsetInMatchSpan(int offset) =>
-      offset >= match.offset && offset <= match.offset + match.length;
+      offset >= match.offset && offset < match.offset + match.length;
 
   Color get underlineColor {
     switch (match.rule?.id ?? "unknown") {

lib/pangea/models/representation_content_model.dart

@@ -131,6 +131,57 @@ class PangeaRepresentation {
     return uses;
   }
 
+  List<OneConstructUse> morphConstructUses({
+    required List<PangeaToken> tokens,
+    Event? event,
+    ConstructUseMetaData? metadata,
+    ChoreoRecord? choreo,
+  }) {
+    final List<OneConstructUse> uses = [];
+
+    if (event?.roomId == null && metadata?.roomId == null) {
+      return uses;
+    }
+
+    if (choreo == null) {
+      return uses;
+    }
+
+    metadata ??= ConstructUseMetaData(
+      roomId: event!.roomId!,
+      eventId: event.eventId,
+      timeStamp: event.originServerTs,
+    );
+
+    for (final step in choreo.choreoSteps) {
+      if (step.acceptedOrIgnoredMatch?.status == PangeaMatchStatus.accepted) {
+        final List<PangeaToken> tokensForMatch = [];
+        for (final token in tokens) {
+          if (step.acceptedOrIgnoredMatch!.isOffsetInMatchSpan(
+            token.text.offset,
+          )) {
+            tokensForMatch.add(token);
+          }
+        }
+
+        for (final token in tokensForMatch) {
+          token.morph.forEach((key, value) {
+            uses.add(
+              OneConstructUse(
+                useType: ConstructUseTypeEnum.ga,
+                lemma: value,
+                categories: [key],
+                constructType: ConstructTypeEnum.morph,
+                metadata: metadata!,
+              ),
+            );
+          });
+        }
+      }
+    }
+    return uses;
+  }
+
   /// Returns a [OneConstructUse] for the given [token]
   /// If there is no [choreo], the [token] is
   /// considered to be a [ConstructUseTypeEnum.wa] as long as it matches the target language.