For #16268 - Allowing multiple task while sharing (#16275)

app/src/main/java/org/mozilla/fenix/share/ShareController.kt

@@ -10,7 +10,8 @@ import android.content.Intent
 import android.content.Intent.ACTION_SEND
 import android.content.Intent.EXTRA_SUBJECT
 import android.content.Intent.EXTRA_TEXT
-import android.content.Intent.FLAG_ACTIVITY_NEW_TASK
+import android.content.Intent.FLAG_ACTIVITY_MULTIPLE_TASK
+import android.content.Intent.FLAG_ACTIVITY_NEW_DOCUMENT
 import android.net.Uri
 import androidx.annotation.VisibleForTesting
 import androidx.navigation.NavController
@@ -95,7 +96,7 @@ class DefaultShareController(
             putExtra(EXTRA_TEXT, getShareText())
             putExtra(EXTRA_SUBJECT, getShareSubject())
             type = "text/plain"
-            flags = FLAG_ACTIVITY_NEW_TASK
+            flags = FLAG_ACTIVITY_NEW_DOCUMENT + FLAG_ACTIVITY_MULTIPLE_TASK
             setClassName(app.packageName, app.activityName)
         }
 

app/src/test/java/org/mozilla/fenix/share/ShareControllerTest.kt

@@ -115,7 +115,7 @@ class ShareControllerTest {
         assertEquals(shareSubject, shareIntent.captured.extras!![Intent.EXTRA_SUBJECT])
         assertEquals(textToShare, shareIntent.captured.extras!![Intent.EXTRA_TEXT])
         assertEquals("text/plain", shareIntent.captured.type)
-        assertEquals(Intent.FLAG_ACTIVITY_NEW_TASK, shareIntent.captured.flags)
+        assertEquals(Intent.FLAG_ACTIVITY_NEW_DOCUMENT + Intent.FLAG_ACTIVITY_MULTIPLE_TASK, shareIntent.captured.flags)
         assertEquals(appPackageName, shareIntent.captured.component!!.packageName)
         assertEquals(appClassName, shareIntent.captured.component!!.className)