[flutter_markdown] remove backgroundColor from code text theme to enable code selection highlight (#7090)

fixes: flutter/flutter#150053
related to : flutter/flutter#96112

Author: HosamHasanRamadan

packages/flutter_markdown/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.7.3+2
+
+* Resolves an issue where code blocks in markdown were not highlighted during selection.
+
 ## 0.7.3+1
 
 * Fixes issue with table column alignments not being respected.

packages/flutter_markdown/lib/src/style_sheet.dart

@@ -104,7 +104,7 @@ class MarkdownStyleSheet {
       p: theme.textTheme.bodyMedium,
       pPadding: EdgeInsets.zero,
       code: theme.textTheme.bodyMedium!.copyWith(
-        backgroundColor: theme.cardTheme.color ?? theme.cardColor,
+        backgroundColor: theme.cardTheme.color,
         fontFamily: 'monospace',
         fontSize: theme.textTheme.bodyMedium!.fontSize! * 0.85,
       ),
@@ -175,9 +175,6 @@ class MarkdownStyleSheet {
       p: theme.textTheme.textStyle,
       pPadding: EdgeInsets.zero,
       code: theme.textTheme.textStyle.copyWith(
-        backgroundColor: theme.brightness == Brightness.dark
-            ? CupertinoColors.systemGrey6.darkColor
-            : CupertinoColors.systemGrey6.color,
         fontFamily: 'monospace',
         fontSize: theme.textTheme.textStyle.fontSize! * 0.85,
       ),
@@ -284,7 +281,7 @@ class MarkdownStyleSheet {
       p: theme.textTheme.bodyMedium,
       pPadding: EdgeInsets.zero,
       code: theme.textTheme.bodyMedium!.copyWith(
-        backgroundColor: theme.cardTheme.color ?? theme.cardColor,
+        backgroundColor: theme.cardTheme.color,
         fontFamily: 'monospace',
         fontSize: theme.textTheme.bodyMedium!.fontSize! * 0.85,
       ),

packages/flutter_markdown/pubspec.yaml

@@ -4,7 +4,7 @@ description: A Markdown renderer for Flutter. Create rich text output,
   formatted with simple Markdown tags.
 repository: https://github.com/flutter/packages/tree/main/packages/flutter_markdown
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+flutter_markdown%22
-version: 0.7.3+1
+version: 0.7.3+2
 
 environment:
   sdk: ^3.3.0

packages/flutter_markdown/test/style_sheet_test.dart

@@ -62,8 +62,6 @@ void defineTests() {
         expect(
             style.code!.fontSize, cTheme.textTheme.textStyle.fontSize! * 0.85);
         expect(style.code!.fontFamily, 'monospace');
-        expect(
-            style.code!.backgroundColor, CupertinoColors.systemGrey6.darkColor);
 
         // H1
         expect(style.h1!.color, cTheme.textTheme.textStyle.color);
@@ -152,7 +150,7 @@ void defineTests() {
         expect(
             style.code!.fontSize, theme.textTheme.bodyMedium!.fontSize! * 0.85);
         expect(style.code!.fontFamily, 'monospace');
-        expect(style.code!.backgroundColor, theme.cardColor);
+        expect(style.code!.backgroundColor, theme.cardTheme.color);
 
         // H1
         expect(style.h1, theme.textTheme.headlineSmall);