Remove link preview images from shared media.

app/src/main/java/org/thoughtcrime/securesms/database/MediaTable.kt

@@ -97,7 +97,8 @@ class MediaTable internal constructor(context: Context?, databaseHelper: SignalD
       """
         ${AttachmentTable.DATA_FILE} IS NOT NULL AND
         ${AttachmentTable.CONTENT_TYPE} NOT LIKE 'image/svg%' AND 
-        (${AttachmentTable.CONTENT_TYPE} LIKE 'image/%' OR ${AttachmentTable.CONTENT_TYPE} LIKE 'video/%')
+        (${AttachmentTable.CONTENT_TYPE} LIKE 'image/%' OR ${AttachmentTable.CONTENT_TYPE} LIKE 'video/%') AND
+        ${MessageTable.LINK_PREVIEWS} IS NULL
       """
     )
 
@@ -106,7 +107,8 @@ class MediaTable internal constructor(context: Context?, databaseHelper: SignalD
       """
         (${AttachmentTable.DATA_FILE} IS NOT NULL OR (${AttachmentTable.CONTENT_TYPE} LIKE 'video/%' AND ${AttachmentTable.REMOTE_INCREMENTAL_DIGEST} IS NOT NULL)) AND
         ${AttachmentTable.CONTENT_TYPE} NOT LIKE 'image/svg%' AND 
-        (${AttachmentTable.CONTENT_TYPE} LIKE 'image/%' OR ${AttachmentTable.CONTENT_TYPE} LIKE 'video/%')
+        (${AttachmentTable.CONTENT_TYPE} LIKE 'image/%' OR ${AttachmentTable.CONTENT_TYPE} LIKE 'video/%') AND
+        ${MessageTable.LINK_PREVIEWS} IS NULL
       """
     )
 
@@ -118,7 +120,14 @@ class MediaTable internal constructor(context: Context?, databaseHelper: SignalD
       """
     )
 
-    private val ALL_MEDIA_QUERY = String.format(BASE_MEDIA_QUERY, "${AttachmentTable.DATA_FILE} IS NOT NULL AND ${AttachmentTable.CONTENT_TYPE} NOT LIKE 'text/x-signal-plain'")
+    private val ALL_MEDIA_QUERY = String.format(
+      BASE_MEDIA_QUERY,
+      """
+        ${AttachmentTable.DATA_FILE} IS NOT NULL AND
+        ${AttachmentTable.CONTENT_TYPE} NOT LIKE 'text/x-signal-plain' AND
+        ${MessageTable.LINK_PREVIEWS} IS NULL
+      """
+    )
 
     private val DOCUMENT_MEDIA_QUERY = String.format(
       BASE_MEDIA_QUERY,