fix: font issue on linux.

app/lib/themes/dark.dart

@@ -18,11 +18,11 @@ var darkTheme = _darkTheme.copyWith(
   textTheme: _darkTheme.textTheme.copyWith(
         headline1: TextStyle(
           color: Color(0xffc0c6d4),
-          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
+          fontFamily: kIsWeb ? null : defaultFontFamily,
         ),
         bodyText2: TextStyle(
           color: Color(0xffc0c6d4),
-          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
+          fontFamily: kIsWeb ? null : defaultFontFamily,
         ),
       ),
   popupMenuTheme: _darkTheme.popupMenuTheme.copyWith(
@@ -34,6 +34,7 @@ var darkTheme = _darkTheme.copyWith(
   tooltipTheme: _darkTheme.tooltipTheme.copyWith(
         textStyle: TextStyle(
           color: Colors.grey,
+          fontFamily: kIsWeb ? null : defaultFontFamily,
         ),
         padding: EdgeInsets.symmetric(horizontal: 3, vertical: 2),
         decoration: BoxDecoration(

app/lib/themes/light.dart

@@ -18,11 +18,11 @@ var lightTheme = _lightTheme.copyWith(
   textTheme: _lightTheme.textTheme.copyWith(
         headline1: TextStyle(
           color: Color(0xff414d68),
-          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
+          fontFamily: kIsWeb ? null : defaultFontFamily,
         ),
         bodyText2: TextStyle(
           color: Color(0xff414d68),
-          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
+          fontFamily: kIsWeb ? null : defaultFontFamily,
         ),
       ),
   popupMenuTheme: _lightTheme.popupMenuTheme.copyWith(
@@ -34,6 +34,7 @@ var lightTheme = _lightTheme.copyWith(
   tooltipTheme: _lightTheme.tooltipTheme.copyWith(
         textStyle: TextStyle(
           color: Colors.grey.shade600,
+          fontFamily: kIsWeb ? null : defaultFontFamily,
         ),
         padding: EdgeInsets.symmetric(horizontal: 3, vertical: 2),
         decoration: BoxDecoration(

app/lib/widgets/dde_markdown_field.dart

@@ -60,8 +60,6 @@ class _DMarkdownFieldState extends State<DMarkdownField> {
                     ? context.watch<SettingsProvider>().activeColor ?? Color(0xff565656)
                     : Color(0xff565656)),
           ),
-          child: DefaultTextStyle(
-            style: context.t.textTheme.bodyText2!,
           child: isPreview
               ? GestureDetector(
                   onTap: widget.readOnly
@@ -77,6 +75,7 @@ class _DMarkdownFieldState extends State<DMarkdownField> {
                       text: _previewText ?? '',
                       padding: EdgeInsets.only(left: 15),
                       onTapLink: H.launchURL,
+                      textStyle: context.t.textTheme.bodyText2,
                       onCodeCopied: () {
                         Notificator.success(
                           context,
@@ -127,7 +126,6 @@ class _DMarkdownFieldState extends State<DMarkdownField> {
                     ActionType.h5: LocaleKeys.md_editor_h5.tr(),
                   },
                 ),
-          ),
         );
       }),
     );

app/lib/widgets/market.dart

@@ -237,8 +237,6 @@ class _MarketWidgetState extends State<MarketWidget> {
                   ),
                   child: Padding(
                     padding: const EdgeInsets.only(left: 8),
-                    child: DefaultTextStyle(
-                      style: context.t.textTheme.bodyText2!,
                     child: MdPreview(
                       text: _schemes.firstWhereOrNull((e) => e.uuid == _selected)?.description ?? '',
                       widgetImage: (imageUrl) => CachedNetworkImage(
@@ -251,12 +249,12 @@ class _MarketWidgetState extends State<MarketWidget> {
                         errorWidget: (context, url, error) => const Icon(Icons.error),
                       ),
                       onTapLink: H.launchURL,
+                      textStyle: context.t.textTheme.bodyText2,
                       onCodeCopied: () {},
                     ),
                   ),
                 ),
               ),
-              ),
             ],
           ),
         ),

app/lib/widgets/me.dart

@@ -242,11 +242,10 @@ class _MeWidgetState extends State<MeWidget> {
                     ),
                     child: Padding(
                       padding: const EdgeInsets.only(left: 8),
-                      child: DefaultTextStyle(
-                        style: context.t.textTheme.bodyText2!,
                       child: MdPreview(
                         text: _schemes.firstWhereOrNull((e) => e.uuid == _selected)?.description ?? '',
                         onTapLink: H.launchURL,
+                        textStyle: context.t.textTheme.bodyText2,
                         widgetImage: (imageUrl) => CachedNetworkImage(
                           imageUrl: imageUrl,
                           placeholder: (context, url) => const SizedBox(
@@ -260,7 +259,6 @@ class _MeWidgetState extends State<MeWidget> {
                       ),
                     ),
                   ),
-                  ),
                 )
               ],
             ),