Fixes two bugs:

-One where deletion causes statuses to lose track of where they are in timelines, so subsequent deletion and other actions are performed on the wrong status.
-It's was possible to infinitely open copies of the same thread, account page, and tag page by just continuously clicking on the status, avatar, or hash tag respectively.

app/src/main/java/com/keylesspalace/tusky/AccountActivity.java

@@ -18,6 +18,7 @@ package com.keylesspalace.tusky;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
@@ -27,7 +28,6 @@ import android.support.v4.view.ViewPager;
 import android.support.v7.app.ActionBar;
 import android.support.v7.widget.Toolbar;
 import android.text.method.LinkMovementMethod;
-import android.util.TypedValue;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -105,10 +105,11 @@ public class AccountActivity extends BaseActivity {
         };
         adapter.setPageTitles(pageTitles);
         ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
-        int pageMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8,
-                getResources().getDisplayMetrics());
+        int pageMargin = getResources().getDimensionPixelSize(R.dimen.tab_page_margin);
         viewPager.setPageMargin(pageMargin);
-        viewPager.setPageMarginDrawable(R.drawable.tab_page_margin_dark);
+        Drawable pageMarginDrawable = ThemeUtils.getDrawable(this, R.attr.tab_page_margin_drawable,
+                R.drawable.tab_page_margin_dark);
+        viewPager.setPageMarginDrawable(pageMarginDrawable);
         viewPager.setAdapter(adapter);
         tabLayout = (TabLayout) findViewById(R.id.tab_layout);
         tabLayout.setupWithViewPager(viewPager);

app/src/main/java/com/keylesspalace/tusky/MainActivity.java

@@ -75,7 +75,7 @@ public class MainActivity extends BaseActivity {
         viewPager.setPageMargin(pageMargin);
         Drawable pageMarginDrawable = ThemeUtils.getDrawable(this, R.attr.tab_page_margin_drawable,
                 R.drawable.tab_page_margin_dark);
-            viewPager.setPageMarginDrawable(pageMarginDrawable);
+        viewPager.setPageMarginDrawable(pageMarginDrawable);
         viewPager.setAdapter(adapter);
         TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
         tabLayout.setupWithViewPager(viewPager);

app/src/main/java/com/keylesspalace/tusky/NotificationsAdapter.java

@@ -103,8 +103,7 @@ class NotificationsAdapter extends RecyclerView.Adapter implements AdapterItemRe
                     FollowViewHolder holder = (FollowViewHolder) viewHolder;
                     holder.setMessage(notification.getDisplayName(), notification.getUsername(),
                             notification.getAvatar());
-                    holder.setupButtons(followListener, notification.getAccountId(),
-                            notification.getUsername());
+                    holder.setupButtons(followListener, notification.getAccountId());
                     break;
                 }
             }
@@ -186,7 +185,7 @@ class NotificationsAdapter extends RecyclerView.Adapter implements AdapterItemRe
     }
 
     interface FollowListener {
-        void onViewAccount(String id, String username);
+        void onViewAccount(String id);
         void onFollow(String id);
     }
 
@@ -224,12 +223,11 @@ class NotificationsAdapter extends RecyclerView.Adapter implements AdapterItemRe
             avatar.setImageUrl(avatarUrl, VolleySingleton.getInstance(context).getImageLoader());
         }
 
-        void setupButtons(final FollowListener listener, final String accountId,
-                final String username) {
+        void setupButtons(final FollowListener listener, final String accountId) {
             avatar.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
-                    listener.onViewAccount(accountId, username);
+                    listener.onViewAccount(accountId);
                 }
             });
             follow.setOnClickListener(new View.OnClickListener() {

app/src/main/java/com/keylesspalace/tusky/NotificationsFragment.java

@@ -257,15 +257,8 @@ public class NotificationsFragment extends SFragment implements
         super.viewTag(tag);
     }
 
-    public void onViewAccount(String id, String username) {
-        super.viewAccount(id, username);
-    }
-
-    public void onViewAccount(int position) {
-        Status status = adapter.getItem(position).getStatus();
-        String id = status.getAccountId();
-        String username = status.getUsername();
-        super.viewAccount(id, username);
+    public void onViewAccount(String id) {
+        super.viewAccount(id);
     }
 
     public void onFollow(String id) {

app/src/main/java/com/keylesspalace/tusky/SFragment.java

@@ -267,18 +267,17 @@ public class SFragment extends Fragment {
         startActivity(intent);
     }
 
-    protected void viewAccount(String id, String username) {
+    protected void viewAccount(String id) {
         Intent intent = new Intent(getContext(), AccountActivity.class);
         intent.putExtra("id", id);
-        intent.putExtra("username", username);
         startActivity(intent);
     }
 
-    protected void openReportPage(String accountId, String accoundUsername, String statusId,
+    protected void openReportPage(String accountId, String accountUsername, String statusId,
             Spanned statusContent) {
         Intent intent = new Intent(getContext(), ReportActivity.class);
         intent.putExtra("account_id", accountId);
-        intent.putExtra("account_username", accoundUsername);
+        intent.putExtra("account_username", accountUsername);
         intent.putExtra("status_id", statusId);
         intent.putExtra("status_content", HtmlUtils.toHtml(statusContent));
         startActivity(intent);

app/src/main/java/com/keylesspalace/tusky/StatusActionListener.java

@@ -25,6 +25,5 @@ interface StatusActionListener {
     void onViewMedia(String url, Status.MediaAttachment.Type type);
     void onViewThread(int position);
     void onViewTag(String tag);
-    void onViewAccount(String id, String username);
-    void onViewAccount(int position);
+    void onViewAccount(String id);
 }

app/src/main/java/com/keylesspalace/tusky/StatusViewHolder.java

@@ -98,7 +98,7 @@ class StatusViewHolder extends RecyclerView.ViewHolder {
         displayName.setText(name);
     }
 
-    void setUsername(String name) {
+    private void setUsername(String name) {
         Context context = username.getContext();
         String format = context.getString(R.string.status_username_format);
         String usernameText = String.format(format, name);
@@ -139,7 +139,7 @@ class StatusViewHolder extends RecyclerView.ViewHolder {
                     ClickableSpan newSpan = new ClickableSpan() {
                         @Override
                         public void onClick(View widget) {
-                            listener.onViewAccount(accountId, accountUsername);
+                            listener.onViewAccount(accountId);
                         }
                     };
                     builder.removeSpan(span);
@@ -294,35 +294,35 @@ class StatusViewHolder extends RecyclerView.ViewHolder {
         content.setVisibility(View.VISIBLE);
     }
 
-    private void setupButtons(final StatusActionListener listener, final int position) {
+    private void setupButtons(final StatusActionListener listener, final String accountId) {
         avatar.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                listener.onViewAccount(position);
+                listener.onViewAccount(accountId);
             }
         });
         replyButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                listener.onReply(position);
+                listener.onReply(getAdapterPosition());
             }
         });
         reblogButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                listener.onReblog(!reblogged, position);
+                listener.onReblog(!reblogged, getAdapterPosition());
             }
         });
         favouriteButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                listener.onFavourite(!favourited, position);
+                listener.onFavourite(!favourited, getAdapterPosition());
             }
         });
         moreButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                listener.onMore(v, position);
+                listener.onMore(v, getAdapterPosition());
             }
         });
         /* Even though the content TextView is a child of the container, it won't respond to clicks
@@ -332,7 +332,7 @@ class StatusViewHolder extends RecyclerView.ViewHolder {
         View.OnClickListener viewThreadListener = new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                listener.onViewThread(position);
+                listener.onViewThread(getAdapterPosition());
             }
         };
         content.setOnClickListener(viewThreadListener);
@@ -361,7 +361,7 @@ class StatusViewHolder extends RecyclerView.ViewHolder {
         if (!sensitive || attachments.length == 0) {
             hideSensitiveMediaWarning();
         }
-        setupButtons(listener, position);
+        setupButtons(listener, status.getAccountId());
         setRebloggingEnabled(status.getVisibility() != Status.Visibility.PRIVATE);
         if (status.getSpoilerText().isEmpty()) {
             hideSpoilerText();

app/src/main/java/com/keylesspalace/tusky/TimelineFragment.java

@@ -312,20 +312,19 @@ public class TimelineFragment extends SFragment implements
     }
 
     public void onViewTag(String tag) {
+        if (kind == Kind.TAG && hashtagOrId.equals(tag)) {
+            // If already viewing a tag page, then ignore any request to view that tag again.
+            return;
+        }
         super.viewTag(tag);
     }
 
-    public void onViewAccount(String id, String username) {
-        super.viewAccount(id, username);
-    }
-
-    public void onViewAccount(int position) {
-        Status status = adapter.getItem(position);
-        Assert.expect(status != null);
-        if (status != null) {
-            String id = status.getAccountId();
-            String username = status.getUsername();
-            super.viewAccount(id, username);
+    public void onViewAccount(String id) {
+        if (kind == Kind.USER && hashtagOrId.equals(id)) {
+            /* If already viewing an account page, then any requests to view that account page
+             * should be ignored. */
+            return;
         }
+        super.viewAccount(id);
     }
 }

app/src/main/java/com/keylesspalace/tusky/ViewThreadFragment.java

@@ -20,7 +20,6 @@ import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.design.widget.Snackbar;
-import android.support.v4.content.ContextCompat;
 import android.support.v7.widget.DividerItemDecoration;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
@@ -40,6 +39,7 @@ import java.util.List;
 public class ViewThreadFragment extends SFragment implements StatusActionListener {
     private RecyclerView recyclerView;
     private ThreadAdapter adapter;
+    private String thisThreadsStatusId;
 
     public static ViewThreadFragment newInstance(String id) {
         Bundle arguments = new Bundle();
@@ -62,7 +62,8 @@ public class ViewThreadFragment extends SFragment implements StatusActionListene
         recyclerView.setLayoutManager(layoutManager);
         DividerItemDecoration divider = new DividerItemDecoration(
                 context, layoutManager.getOrientation());
-        Drawable drawable = ContextCompat.getDrawable(context, R.drawable.status_divider_dark);
+        Drawable drawable = ThemeUtils.getDrawable(context, R.attr.status_divider_drawable,
+                R.drawable.status_divider_dark);
         divider.setDrawable(drawable);
         recyclerView.addItemDecoration(divider);
         adapter = new ThreadAdapter(this);
@@ -71,6 +72,7 @@ public class ViewThreadFragment extends SFragment implements StatusActionListene
         String id = getArguments().getString("id");
         sendStatusRequest(id);
         sendThreadRequest(id);
+        thisThreadsStatusId = id;
 
         return rootView;
     }
@@ -159,21 +161,19 @@ public class ViewThreadFragment extends SFragment implements StatusActionListene
     }
 
     public void onViewThread(int position) {
-        super.viewThread(adapter.getItem(position));
+        Status status = adapter.getItem(position);
+        if (thisThreadsStatusId.equals(status.getId())) {
+            // If already viewing this thread, don't reopen it.
+            return;
+        }
+        super.viewThread(status);
     }
 
     public void onViewTag(String tag) {
         super.viewTag(tag);
     }
 
-    public void onViewAccount(String id, String username) {
-        super.viewAccount(id, username);
-    }
-
-    public void onViewAccount(int position) {
-        Status status = adapter.getItem(position);
-        String id = status.getAccountId();
-        String username = status.getUsername();
-        super.viewAccount(id, username);
+    public void onViewAccount(String id) {
+        super.viewAccount(id);
     }
 }