Add a setting to disable the automatic speed test to determine latency bounds

Implements https://github.com/Ch4t4r/Nebulo/issues/7

app/src/main/java/com/frostnerd/smokescreen/fragment/MainFragment.kt

@@ -379,6 +379,8 @@ class MainFragment : Fragment() {
         // But if a "good" server has a bad connection, chances are the smaller ones do as well
         // And in that case the smaller server should be measured on the bigger ones to have a point of reference
         // as the values I chose are between average to best-case, not worst-case.
+        if(!context.getPreferences().compareDnsSpeedsAtLaunch) return
+
         launchWithLifecycle {
             val httpsEngine =  createHttpCronetEngineIfInstalled(context)
             val fastServerAverage = (AbstractHttpsDNSHandle.suspendUntilKnownServersArePopulated(

app/src/main/java/com/frostnerd/smokescreen/util/preferences/AppSettings.kt

@@ -239,6 +239,7 @@ class AppSettingsSharedPreferences(context: Context) : AppSettings, SimpleTypedP
     var restartVpnOnNetworkChange:Boolean by booleanPref("restart_vpn_networkchange", false)
     override var bypassSearchdomains: Boolean by booleanPref("bypass_searchdomains", true)
     override var pauseOnCaptivePortal: Boolean by booleanPref("pause_on_captive_portal", true)
+    var compareDnsSpeedsAtLaunch: Boolean by booleanPref("compare_dns_speeds", true)
     var mapQueryRefusedToHostBlock:Boolean by booleanPref("map_query_refused", true)
 
     override var queryLoggingEnabled: Boolean by booleanPref("log_dns_queries", false)

app/src/main/res/values/strings-preference.xml

@@ -148,6 +148,8 @@
     <string name="title_pause_on_captiveportal">Pause on captive portal</string>
     <string name="summary_pause_on_captiveportal">Don\'t use DoH if a captive portal is detected. It will automatically be resumed shortly after logging in.\nDisabling it might prevent you from opening the captive portal site to log in</string>
 
+    <string name="title_test_speed_comparison">Server speed comparison</string>
+    <string name="summary_test_speed_comparison">When on the main screen, determine the latency to popular servers to better indicate the latency of the current active server</string>
 
     <string name="preference_category_querylogging">Query logging</string>
 

app/src/main/res/xml/preferences_network.xml

@@ -37,5 +37,11 @@
                 android:key="pause_on_captive_portal"
                 android:summary="@string/summary_pause_on_captiveportal"
                 android:title="@string/title_pause_on_captiveportal" />
+
+        <CheckBoxPreference
+            android:defaultValue="true"
+            android:key="compare_dns_speeds"
+            android:summary="@string/summary_test_speed_comparison"
+            android:title="@string/title_test_speed_comparison"/>
     </androidx.preference.PreferenceCategory>
 </androidx.preference.PreferenceScreen>
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