sessions: failsafe session is now accessible via separate launcher icon

Also enables session autoclosing so no more "annoying" messages
about "process completed - press enter". There autoclosing will be
performed on exit codes '0' and '130'.

On Android TV devices old behaviour will be used - auto close enabled for all
sessions when amount of running sessions >1.

app/src/main/AndroidManifest.xml

@@ -37,14 +37,25 @@
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT"/>
             </intent-filter>
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT"/>
             </intent-filter>
             <meta-data android:name="android.app.shortcuts" android:resource="@xml/shortcuts" />
         </activity>
 
+        <activity
+            android:name="com.termux.app.TermuxFailsafeActivity"
+            android:label="@string/app_failsafe_mode" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
         <activity
             android:name="com.termux.app.TermuxHelpActivity"
             android:exported="false"

app/src/main/java/com/termux/app/TermuxActivity.java

@@ -367,8 +367,18 @@ public final class TermuxActivity extends Activity implements ServiceConnection
                         showToast(toToastTitle(finishedSession) + " - exited", true);
                 }
 
-                if (mTermService.getSessions().size() > 1) {
+                if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_LEANBACK)) {
-                    removeFinishedSession(finishedSession);
+                    // On Android TV devices we need to use older behaviour because we may
+                    // not be able to have multiple launcher icons.
+                    if (mTermService.getSessions().size() > 1) {
+                        removeFinishedSession(finishedSession);
+                    }
+                } else {
+                    // Once we have a separate launcher icon for the failsafe session, it
+                    // should be safe to auto-close session on exit code '0' or '130'.
+                    if (finishedSession.getExitStatus() == 0 || finishedSession.getExitStatus() == 130) {
+                        removeFinishedSession(finishedSession);
+                    }
                 }
 
                 mListViewAdapter.notifyDataSetChanged();
@@ -465,8 +475,13 @@ public final class TermuxActivity extends Activity implements ServiceConnection
                 TermuxInstaller.setupIfNeeded(TermuxActivity.this, () -> {
                     if (mTermService == null) return; // Activity might have been destroyed.
                     try {
+                        Bundle bundle = getIntent().getExtras();
+                        boolean launchFailsafe = false;
+                        if (bundle != null) {
+                            launchFailsafe = bundle.getBoolean(TermuxFailsafeActivity.TERMUX_FAILSAFE_SESSION_ACTION, false);
+                        }
                         clearTemporaryDirectory();
-                        addNewSession(false, null);
+                        addNewSession(launchFailsafe, null);
                     } catch (WindowManager.BadTokenException e) {
                         // Activity finished - ignore.
                     }

app/src/main/java/com/termux/app/TermuxFailsafeActivity.java

@@ -0,0 +1,19 @@
+package com.termux.app;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+
+public final class TermuxFailsafeActivity extends Activity {
+
+    public static final String TERMUX_FAILSAFE_SESSION_ACTION = "com.termux.app.failsafe_session";
+
+    @Override
+    public void onCreate(Bundle bundle) {
+        super.onCreate(bundle);
+        Intent intent = new Intent(TermuxFailsafeActivity.this, TermuxActivity.class);
+        intent.putExtra(TERMUX_FAILSAFE_SESSION_ACTION, true);
+        startActivity(intent);
+        finish();
+    }
+}

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

@@ -2,6 +2,7 @@
 <resources>
    <string name="application_name">Termux</string>
    <string name="shared_user_label">Termux user</string>
+   <string name="app_failsafe_mode">Termux (failsafe)</string>
    <string name="new_session">New session</string>
    <string name="new_session_failsafe">Failsafe</string>
    <string name="toggle_soft_keyboard">Keyboard</string>