Fix API 23 regression for activities without layout, see http://stackoverflow.com/q/32169303

OpenKeychain/src/main/AndroidManifest.xml

@@ -466,7 +466,7 @@
             android:name=".ui.ImportKeysProxyActivity"
             android:configChanges="orientation|screenSize|keyboardHidden|keyboard"
             android:label="@string/app_name"
-            android:theme="@android:style/Theme.NoDisplay"
+            android:theme="@style/Theme.Keychain.Transparent"
             android:windowSoftInputMode="stateHidden">
 
             <!-- VIEW with fingerprint scheme:
@@ -692,19 +692,19 @@
             android:label="@string/title_log_display" />
         <activity
             android:name=".ui.ConsolidateDialogActivity"
-            android:theme="@android:style/Theme.NoDisplay" />
+            android:theme="@style/Theme.Keychain.Transparent" />
         <activity
             android:name=".ui.PassphraseDialogActivity"
-            android:theme="@android:style/Theme.NoDisplay" />
+            android:theme="@style/Theme.Keychain.Transparent" />
         <activity
             android:name=".ui.RetryUploadDialogActivity"
-            android:theme="@android:style/Theme.NoDisplay" />
+            android:theme="@style/Theme.Keychain.Transparent" />
         <activity
             android:name=".ui.DeleteKeyDialogActivity"
-            android:theme="@android:style/Theme.NoDisplay" />
+            android:theme="@style/Theme.Keychain.Transparent" />
         <activity
             android:name=".ui.OrbotRequiredDialogActivity"
-            android:theme="@android:style/Theme.NoDisplay" />
+            android:theme="@style/Theme.Keychain.Transparent" />
         <!--
         NOTE: singleTop is set to get NFC foreground dispatch to work.
               Then, all NFC intents will be broadcasted to onNewIntent() of this activity!

OpenKeychain/src/main/res/values-v23/themes.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <!-- see http://stackoverflow.com/questions/32169303/activity-did-not-call-finish-api-23 -->
+    <style name="Theme.Keychain.Transparent" parent="@android:style/Theme.Translucent.NoTitleBar" />
+
+</resources>

OpenKeychain/src/main/res/values/themes.xml

@@ -85,11 +85,9 @@
         <item name="alertDialogTheme">@style/Theme.Keychain.Dark.Dialog.Alert</item>
     </style>
 
-    <style name="Theme.Keychain.Light" parent="Base.Theme.Keychain.Light">
-    </style>
+    <style name="Theme.Keychain.Light" parent="Base.Theme.Keychain.Light"></style>
 
-    <style name="Theme.Keychain.Dark" parent="Base.Theme.Keychain.Dark">
-    </style>
+    <style name="Theme.Keychain.Dark" parent="Base.Theme.Keychain.Dark"></style>
 
     <!-- http://android-developers.blogspot.de/2014/10/appcompat-v21-material-design-for-pre.html -->
     <style name="Widget.Keychain.SearchView" parent="Widget.AppCompat.SearchView">
@@ -134,4 +132,6 @@
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>
     </style>
+
+    <style name="Theme.Keychain.Transparent" parent="@android:style/Theme.NoDisplay" />
 </resources>