Previous commit fixes

TMessagesProj/src/main/java/org/telegram/messenger/ConnectionsManager.java

@@ -147,7 +147,8 @@ public class ConnectionsManager implements Action.ActionDelegate, TcpConnection.
 
             if (datacenters != null) {
                 MessagesController.getInstance().updateTimerProc();
-                if (datacenterWithId(currentDatacenterId).authKey != null) {
+                Datacenter datacenter = datacenterWithId(currentDatacenterId);
+                if (datacenter != null && datacenter.authKey != null) {
                     if (lastPingTime < System.currentTimeMillis() - 19000) {
                         lastPingTime = System.currentTimeMillis();
                         generatePing();

TMessagesProj/src/main/java/org/telegram/ui/ChatActivity.java

@@ -1036,6 +1036,9 @@ public class ChatActivity extends BaseFragment implements SizeNotifierRelativeLa
 
     private String getTrimmedString(String src) {
         String result = src.trim();
+        if (result.length() == 0) {
+            return result;
+        }
         while (src.startsWith("\n")) {
             src = src.substring(1);
         }

TMessagesProj/src/main/java/org/telegram/ui/Views/ActionBar/ActionBar.java

@@ -107,9 +107,10 @@ public class ActionBar extends FrameLayout {
 
     private void updateBackOverlay(int widthMeasureSpec, int heightMeasureSpec) {
         if (currentLayer != null) {
-            currentLayer.setBackLayoutVisible(currentBackOverlay == null ? VISIBLE : INVISIBLE);
+            currentLayer.setBackLayoutVisible(currentLayer.isSearchFieldVisible || currentBackOverlay == null ? VISIBLE : INVISIBLE);
         }
         if (currentBackOverlay != null) {
+            currentBackOverlay.setVisibility(currentLayer.isSearchFieldVisible ? GONE : VISIBLE);
             ViewGroup.LayoutParams layoutParams = currentBackOverlay.getLayoutParams();
             if (currentLayer != null) {
                 currentLayer.measure(widthMeasureSpec, heightMeasureSpec);

TMessagesProj/src/main/java/org/telegram/ui/Views/ActionBar/ActionBarLayer.java

@@ -40,6 +40,7 @@ public class ActionBarLayer extends FrameLayout {
     private ActionBar parentActionBar;
     private boolean oldUseLogo;
     private boolean oldUseBack;
+    private boolean isBackLayoutHidden = false;
     protected boolean isSearchFieldVisible;
     public ActionBarMenuOnItemClick actionBarMenuOnItemClick;
 
@@ -329,7 +330,8 @@ public class ActionBarLayer extends FrameLayout {
     }
 
     public void setBackLayoutVisible(int visibility) {
-        backButtonFrameLayout.setVisibility(visibility);
+        isBackLayoutHidden = visibility != VISIBLE;
+        backButtonFrameLayout.setVisibility(isSearchFieldVisible ? VISIBLE : visibility);
     }
 
     public int getBackLayoutWidth() {
@@ -406,6 +408,11 @@ public class ActionBarLayer extends FrameLayout {
         } else {
             setDisplayHomeAsUpEnabled(oldUseBack);
         }
+        if (visible) {
+            backButtonFrameLayout.setVisibility(VISIBLE);
+        } else {
+            backButtonFrameLayout.setVisibility(isBackLayoutHidden ? INVISIBLE : VISIBLE);
+        }
         logoImageView.setImageResource(visible ? R.drawable.ic_ab_search : R.drawable.ic_ab_logo);
     }