only ask to open link in webxdc

src/main/java/org/thoughtcrime/securesms/LocalHelpActivity.java

@@ -14,9 +14,6 @@ public class LocalHelpActivity extends WebViewActivity
 {
   public static final String SECTION_EXTRA = "section_extra";
 
-  @Override
-  protected boolean shouldAskToOpenLink() { return false; }
-
   @Override
   protected boolean allowInLockedMode() { return true; }
 

src/main/java/org/thoughtcrime/securesms/WebViewActivity.java

@@ -37,7 +37,7 @@ public class WebViewActivity extends PassphraseRequiredActionBarActivity
 
   protected WebView webView;
 
-  protected boolean shouldAskToOpenLink() { return true; }
+  protected boolean shouldAskToOpenLink() { return false; }
 
   protected void toggleFakeProxy(boolean enable) {
     if (WebViewFeature.isFeatureSupported(WebViewFeature.PROXY_OVERRIDE)) {

src/main/java/org/thoughtcrime/securesms/WebxdcActivity.java

@@ -339,9 +339,12 @@ public class WebxdcActivity extends WebViewActivity implements DcEventCenter.DcE
     }
   }
 
+  @Override
+  protected boolean shouldAskToOpenLink() { return true; }
+
   // This is usually only called when internetAccess == true or for mailto/openpgp4fpr scheme,
   // because when internetAccess == false, the page is loaded inside an iframe,
-  // and WebViewClient.shouldOverrideUrlLoading is not called for HTTP(S) links inside the iframe
+  // and WebViewClient.shouldOverrideUrlLoading is not called for HTTP(S) links inside the iframe unless target=_blank is used
   @Override
   protected boolean openOnlineUrl(String url) {
     Log.i(TAG, "openOnlineUrl: " + url);