Bug 1840894 - Adjust Print Error UI to use Snackbars

This bug adjusts print errors to use the new snackbar component and
removes the prior toast used for errors.

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

@@ -5,8 +5,6 @@
 package org.mozilla.fenix.share
 
 import android.content.Context
-import android.widget.Toast
-import android.widget.Toast.LENGTH_LONG
 import androidx.annotation.VisibleForTesting
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -23,7 +21,6 @@ import org.mozilla.fenix.R
 import org.mozilla.fenix.browser.StandardSnackbarError
 import org.mozilla.fenix.components.appstate.AppAction
 import org.mozilla.fenix.ext.components
-import org.mozilla.gecko.util.ThreadUtils
 import org.mozilla.geckoview.GeckoSession
 import org.mozilla.geckoview.GeckoSession.GeckoPrintException.ERROR_NO_ACTIVITY_CONTEXT
 import org.mozilla.geckoview.GeckoSession.GeckoPrintException.ERROR_NO_ACTIVITY_CONTEXT_DELEGATE
@@ -78,11 +75,13 @@ class SaveToPDFMiddleware(
                 postTelemetryCompleted(ctx.state.findTab(action.tabId), isPrint = true)
             }
             is EngineAction.PrintContentExceptionAction -> {
-                // Bug 1840894 - will update this toast to a snackbar with new snackbar error component
-                ThreadUtils.runOnUiThread {
-                    Toast.makeText(context, R.string.unable_to_print_error, LENGTH_LONG).show()
-                }
-
+                context.components.appStore.dispatch(
+                    AppAction.UpdateStandardSnackbarErrorAction(
+                        StandardSnackbarError(
+                            context.getString(R.string.unable_to_print_error),
+                        ),
+                    ),
+                )
                 postTelemetryFailed(ctx.state.findTab(action.tabId), action.throwable, isPrint = true)
             }
             else -> {

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

@@ -274,7 +274,7 @@ class SaveToPDFMiddlewareTest {
     }
 
     @Test
-    fun `GIVEN a print request WHEN it fails unexpectedly THEN unknown failure telemetry is sent`() = runTestOnMain {
+    fun `GIVEN a print request WHEN it fails unexpectedly THEN unknown failure telemetry is sent AND a snackbar error is shown`() = runTestOnMain {
         val exceptionToThrow = RuntimeException("No Print Spooler")
         val middleware = SaveToPDFMiddleware(testContext)
         val mockEngineSession: EngineSession = mockk<EngineSession>().apply {
@@ -307,10 +307,19 @@ class SaveToPDFMiddlewareTest {
         assertEquals("unknown", reason)
         val source = response?.extra?.get("source")
         assertEquals("unknown", source)
+        verify {
+            appStore.dispatch(
+                AppAction.UpdateStandardSnackbarErrorAction(
+                    StandardSnackbarError(
+                        testContext.getString(R.string.unable_to_print_error),
+                    ),
+                ),
+            )
+        }
     }
 
     @Test
-    fun `GIVEN a print request WHEN it fails due to print exception THEN print exception failure telemetry is sent`() = runTestOnMain {
+    fun `GIVEN a print request WHEN it fails due to print exception THEN print exception failure telemetry is sent AND a snackbar error is shown`() = runTestOnMain {
         val exceptionToThrow = MockGeckoPrintException()
         val middleware = SaveToPDFMiddleware(testContext)
         val mockEngineSession: EngineSession = mockk<EngineSession>().apply {
@@ -341,6 +350,15 @@ class SaveToPDFMiddlewareTest {
         assertEquals("no_settings_service", reason)
         val source = response?.extra?.get("source")
         assertEquals("unknown", source)
+        verify {
+            appStore.dispatch(
+                AppAction.UpdateStandardSnackbarErrorAction(
+                    StandardSnackbarError(
+                        testContext.getString(R.string.unable_to_print_error),
+                    ),
+                ),
+            )
+        }
     }
 
     @Test