refactor: Enable lint use_build_context_synchronously

lib/pages/chat/chat.dart

@@ -211,6 +211,7 @@ class ChatController extends State<ChatPageWithRoom>
       context: context,
       future: room.leave,
     );
+    if (!mounted) return;
     if (success.error != null) return;
     context.go('/rooms');
   }
@@ -475,8 +476,9 @@ class ChatController extends State<ChatPageWithRoom>
   Future<void>? loadTimelineFuture;
 
   Future<void> _getTimeline({String? eventContextId}) async {
-    await Matrix.of(context).client.roomsLoading;
-    await Matrix.of(context).client.accountDataLoading;
+    final matrix = Matrix.of(context);
+    await matrix.client.roomsLoading;
+    await matrix.client.accountDataLoading;
     if (eventContextId != null &&
         (!eventContextId.isValidMatrixId || eventContextId.sigil != '\$')) {
       eventContextId = null;
@@ -632,6 +634,7 @@ class ChatController extends State<ChatPageWithRoom>
   Future<void> sendFileAction({FileType type = FileType.any}) async {
     final files = await selectFiles(context, allowMultiple: true, type: type);
     if (files.isEmpty) return;
+    if (!mounted) return;
     await showAdaptiveDialog(
       context: context,
       builder: (c) => SendFileDialog(
@@ -663,6 +666,7 @@ class ChatController extends State<ChatPageWithRoom>
     FocusScope.of(context).requestFocus(FocusNode());
     final file = await ImagePicker().pickImage(source: ImageSource.camera);
     if (file == null) return;
+    if (!mounted) return;
 
     await showAdaptiveDialog(
       context: context,
@@ -684,6 +688,7 @@ class ChatController extends State<ChatPageWithRoom>
       maxDuration: const Duration(minutes: 1),
     );
     if (file == null) return;
+    if (!mounted) return;
 
     await showAdaptiveDialog(
       context: context,
@@ -726,26 +731,27 @@ class ChatController extends State<ChatPageWithRoom>
       mimeType: mimeType,
     );
 
-    room
-        .sendFileEvent(
-          file,
-          inReplyTo: replyEvent,
-          threadRootEventId: activeThreadId,
-          extraContent: {
-            'info': {...file.info, 'duration': duration},
-            'org.matrix.msc3245.voice': {},
-            'org.matrix.msc1767.audio': {
-              'duration': duration,
-              'waveform': waveform,
-            },
+    try {
+      await room.sendFileEvent(
+        file,
+        inReplyTo: replyEvent,
+        threadRootEventId: activeThreadId,
+        extraContent: {
+          'info': {...file.info, 'duration': duration},
+          'org.matrix.msc3245.voice': {},
+          'org.matrix.msc1767.audio': {
+            'duration': duration,
+            'waveform': waveform,
           },
-        )
-        .catchError((e) {
-          scaffoldMessenger.showSnackBar(
-            SnackBar(content: Text((e as Object).toLocalizedString(context))),
-          );
-          return null;
-        });
+        },
+      );
+    } catch (e) {
+      if (!mounted) return;
+      scaffoldMessenger.showSnackBar(
+        SnackBar(content: Text(e.toLocalizedString(context))),
+      );
+      return;
+    }
     setState(() {
       replyEvent = null;
     });
@@ -807,29 +813,30 @@ class ChatController extends State<ChatPageWithRoom>
 
   Future<void> reportEventAction() async {
     final event = selectedEvents.single;
+    final l10n = L10n.of(context);
+    final scaffoldMessenger = ScaffoldMessenger.of(context);
     final score = await showModalActionPopup<int>(
       context: context,
-      title: L10n.of(context).reportMessage,
-      message: L10n.of(context).howOffensiveIsThisContent,
-      cancelLabel: L10n.of(context).cancel,
+      title: l10n.reportMessage,
+      message: l10n.howOffensiveIsThisContent,
+      cancelLabel: l10n.cancel,
       actions: [
-        AdaptiveModalAction(
-          value: -100,
-          label: L10n.of(context).extremeOffensive,
-        ),
-        AdaptiveModalAction(value: -50, label: L10n.of(context).offensive),
-        AdaptiveModalAction(value: 0, label: L10n.of(context).inoffensive),
+        AdaptiveModalAction(value: -100, label: l10n.extremeOffensive),
+        AdaptiveModalAction(value: -50, label: l10n.offensive),
+        AdaptiveModalAction(value: 0, label: l10n.inoffensive),
       ],
     );
     if (score == null) return;
+    if (!mounted) return;
     final reason = await showTextInputDialog(
       context: context,
-      title: L10n.of(context).whyDoYouWantToReportThis,
-      okLabel: L10n.of(context).ok,
-      cancelLabel: L10n.of(context).cancel,
-      hintText: L10n.of(context).reason,
+      title: l10n.whyDoYouWantToReportThis,
+      okLabel: l10n.ok,
+      cancelLabel: l10n.cancel,
+      hintText: l10n.reason,
     );
     if (reason == null || reason.isEmpty) return;
+    if (!mounted) return;
     final result = await showFutureLoadingDialog(
       context: context,
       future: () => Matrix.of(context).client.reportEvent(
@@ -840,12 +847,13 @@ class ChatController extends State<ChatPageWithRoom>
       ),
     );
     if (result.error != null) return;
+    if (!mounted) return;
     setState(() {
       showEmojiPicker = false;
       selectedEvents.clear();
     });
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(content: Text(L10n.of(context).contentHasBeenReported)),
+    scaffoldMessenger.showSnackBar(
+      SnackBar(content: Text(l10n.contentHasBeenReported)),
     );
   }
 
@@ -861,6 +869,7 @@ class ChatController extends State<ChatPageWithRoom>
       }
       setState(selectedEvents.clear);
     } catch (e, s) {
+      if (!mounted) return;
       ErrorReporter(
         context,
         'Error while delete error events action',
@@ -885,6 +894,7 @@ class ChatController extends State<ChatPageWithRoom>
         : null;
     if (reasonInput == null) return;
     final reason = reasonInput.isEmpty ? null : reasonInput;
+    if (!mounted) return;
     await showFutureLoadingDialog(
       context: context,
       futureWithProgress: (onProgress) async {
@@ -1239,6 +1249,7 @@ class ChatController extends State<ChatPageWithRoom>
       okLabel: L10n.of(context).unpin,
       cancelLabel: L10n.of(context).cancel,
     );
+    if (!mounted) return;
     if (response == OkCancelResult.ok) {
       final events = room.pinnedEventIds
         ..removeWhere((oldEvent) => oldEvent == eventId);
@@ -1328,17 +1339,18 @@ class ChatController extends State<ChatPageWithRoom>
   Future<void> onPhoneButtonTap() async {
     // VoIP required Android SDK 21
     if (PlatformInfos.isAndroid) {
-      DeviceInfoPlugin().androidInfo.then((value) {
-        if (value.version.sdkInt < 21) {
-          Navigator.pop(context);
-          showOkAlertDialog(
-            context: context,
-            title: L10n.of(context).unsupportedAndroidVersion,
-            message: L10n.of(context).unsupportedAndroidVersionLong,
-            okLabel: L10n.of(context).close,
-          );
-        }
-      });
+      final androidInfo = await DeviceInfoPlugin().androidInfo;
+      if (!mounted) return;
+      if (androidInfo.version.sdkInt < 21) {
+        Navigator.pop(context);
+        await showOkAlertDialog(
+          context: context,
+          title: L10n.of(context).unsupportedAndroidVersion,
+          message: L10n.of(context).unsupportedAndroidVersionLong,
+          okLabel: L10n.of(context).close,
+        );
+        return;
+      }
     }
     final callType = await showModalActionPopup<CallType>(
       context: context,
@@ -1359,11 +1371,13 @@ class ChatController extends State<ChatPageWithRoom>
       ],
     );
     if (callType == null) return;
+    if (!mounted) return;
 
     final voipPlugin = Matrix.of(context).voipPlugin;
     try {
       await voipPlugin!.voip.inviteToCall(room, callType);
     } catch (e) {
+      if (!mounted) return;
       ScaffoldMessenger.of(
         context,
       ).showSnackBar(SnackBar(content: Text(e.toLocalizedString(context))));