Use inset list style for preferences on iOS 14

Tusker/Screens/Preferences/AdvancedPrefsView.swift

@@ -16,8 +16,9 @@ struct AdvancedPrefsView : View {
             formattingSection
             automationSection
             cachingSection
-        }.listStyle(GroupedListStyle())
-            .navigationBarTitle(Text("Advanced"))
+        }
+        .insetOrGroupedListStyle()
+        .navigationBarTitle(Text("Advanced"))
     }
     
     var formattingFooter: some View {
@@ -44,7 +45,7 @@ struct AdvancedPrefsView : View {
     }
     
     var cachingSection: some View {
-        Section(header: Text("Caching")) {
+        Section(header: Text("Caching"), footer: Text("Clearing caches will restart the app.")) {
             Button(action: clearCache) {
                 Text("Clear Mastodon Cache")
             }.foregroundColor(.red)

Tusker/Screens/Preferences/AppearancePrefsView.swift

@@ -33,8 +33,8 @@ struct AppearancePrefsView : View {
             accountsSection
             postsSection
         }
-            .listStyle(GroupedListStyle())
-            .navigationBarTitle(Text("Appearance"))
+        .insetOrGroupedListStyle()
+        .navigationBarTitle(Text("Appearance"))
     }
     
     private var accountsSection: some View {

Tusker/Screens/Preferences/BehaviorPrefsView.swift

@@ -14,7 +14,9 @@ struct BehaviorPrefsView: View {
     var body: some View {
         List {
             linksSection
-        }.listStyle(GroupedListStyle()).navigationBarTitle(Text("Behavior"))
+        }
+        .insetOrGroupedListStyle()
+        .navigationBarTitle(Text("Behavior"))
     }
 
     var linksSection: some View {

Tusker/Screens/Preferences/ComposingPrefsView.swift

@@ -16,7 +16,9 @@ struct ComposingPrefsView: View {
         List {
             composingSection
             replyingSection
-        }.listStyle(GroupedListStyle()).navigationBarTitle("Composing")
+        }
+        .insetOrGroupedListStyle()
+        .navigationBarTitle("Composing")
     }
     
     var composingSection: some View {

Tusker/Screens/Preferences/MediaPrefsView.swift

@@ -14,7 +14,9 @@ struct MediaPrefsView: View {
     var body: some View {
         List {
             viewingSection
-        }.listStyle(GroupedListStyle()).navigationBarTitle("Media")
+        }
+        .insetOrGroupedListStyle()
+        .navigationBarTitle("Media")
     }
     
     var viewingSection: some View {

Tusker/Screens/Preferences/PreferencesView.swift

@@ -15,7 +15,7 @@ struct PreferencesView: View {
         // workaround: the navigation view is provided by MyProfileTableViewController so that it can inject the Done button
 //        NavigationView {
             List {
-                Section {
+                Section(header: Text("Accounts")) {
                     ForEach(localData.accounts, id: \.accessToken) { (account) in
                         Button(action: {
                             NotificationCenter.default.post(name: .activateAccount, object: nil, userInfo: ["account": account])
@@ -75,8 +75,8 @@ struct PreferencesView: View {
                     }
                 }
             }
-                .listStyle(GroupedListStyle())
-                .navigationBarTitle(Text("Preferences"), displayMode: .inline)
+            .insetOrGroupedListStyle()
+            .navigationBarTitle(Text("Preferences"), displayMode: .inline)
 //        }
     }
     
@@ -85,6 +85,17 @@ struct PreferencesView: View {
     }
 }
 
+extension View {
+    @ViewBuilder
+    func insetOrGroupedListStyle() -> some View {
+        if #available(iOS 14.0, *) {
+            self.listStyle(InsetGroupedListStyle())
+        } else {
+            self.listStyle(GroupedListStyle())
+        }
+    }
+}
+
 #if DEBUG
 struct PreferencesView_Previews : PreviewProvider {
     static var previews: some View {

Tusker/Screens/Preferences/SilentActionPrefs.swift

@@ -14,7 +14,7 @@ struct SilentActionPrefs : View {
         List(Array(preferences.silentActions.keys), id: \.self) { source in
             SilentActionPermissionCell(source: source)
         }
-            .listStyle(GroupedListStyle())
+        .insetOrGroupedListStyle()
 //            .navigationBarTitle("Silent Action Permissions")
         // see FB6838291
     }

Tusker/Screens/Preferences/WellnessPrefsView.swift

@@ -15,8 +15,9 @@ struct WellnessPrefsView: View {
         List {
             showFavAndReblogCountSection
             notificationsModeSection
-        }.listStyle(GroupedListStyle())
-            .navigationBarTitle(Text("Digital Wellness"))
+        }
+        .insetOrGroupedListStyle()
+        .navigationBarTitle(Text("Digital Wellness"))
     }
     
     var showFavAndReblogCountSection: some View {