Ensure that the application rotate the QrCode if one day the SDK emits the .Expired error. (#6993)

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/linknewdevice/RustLinkMobileHandler.kt

@@ -51,6 +51,10 @@ class RustLinkMobileHandler(
             )
             // We emit Done in case the progress listener was deallocated before generate() sent the Done
             _linkMobileStep.emit(LinkMobileStep.Done)
+        } catch (e: HumanQrGrantLoginException.Expired) {
+            // Note: the SDK does not return this error, but is returning `.NotFound` instead when the QR code expires. We catch both just in case.
+            Timber.tag(tag.value).w(e, "QR code has expired")
+            _linkMobileStep.emit(LinkMobileStep.QrRotating)
         } catch (e: HumanQrGrantLoginException.NotFound) {
             Timber.tag(tag.value).w(e, "Error during QR login grant")
             // Catch timeout here?

libraries/matrix/impl/src/test/kotlin/io/element/android/libraries/matrix/impl/linknewdevice/RustLinkMobileHandlerTest.kt

@@ -147,6 +147,32 @@ class RustLinkMobileHandlerTest {
         }
     }
 
+    @Test
+    fun `when start throws HumanQrGrantLoginException_Expired, the handler emits QrRotating step`() = runTest {
+        val completable = CompletableDeferred<Unit>()
+        val handler = FakeFfiGrantLoginWithQrCodeHandler(
+            generateResult = {
+                completable.await()
+                throw HumanQrGrantLoginException.Expired("Expired")
+            }
+        )
+        val sut = createRustLinkMobileHandler(
+            handler,
+        )
+        sut.linkMobileStep.test {
+            val initialItem = awaitItem()
+            assertThat(initialItem).isEqualTo(LinkMobileStep.Uninitialized)
+            backgroundScope.launch {
+                sut.start()
+            }
+            runCurrent()
+            // generate returns, error is emitted
+            completable.complete(Unit)
+            val qrRotatingState = awaitItem()
+            assertThat(qrRotatingState).isEqualTo(LinkMobileStep.QrRotating)
+        }
+    }
+
     private fun TestScope.createRustLinkMobileHandler(
         handler: FakeFfiGrantLoginWithQrCodeHandler = FakeFfiGrantLoginWithQrCodeHandler(),
     ) = RustLinkMobileHandler(