Probably fix empty emoji picker

mastodon/src/main/java/org/joinmastodon/android/api/session/AccountSessionManager.java

@@ -10,6 +10,7 @@ import android.util.Log;
 
 import com.google.gson.JsonParseException;
 
+import org.joinmastodon.android.E;
 import org.joinmastodon.android.MastodonApp;
 import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.MastodonAPIController;
@@ -18,6 +19,7 @@ import org.joinmastodon.android.api.requests.instance.GetCustomEmojis;
 import org.joinmastodon.android.api.requests.accounts.GetOwnAccount;
 import org.joinmastodon.android.api.requests.instance.GetInstance;
 import org.joinmastodon.android.api.requests.oauth.CreateOAuthApp;
+import org.joinmastodon.android.events.EmojiUpdatedEvent;
 import org.joinmastodon.android.model.Account;
 import org.joinmastodon.android.model.Application;
 import org.joinmastodon.android.model.Emoji;
@@ -260,7 +262,7 @@ public class AccountSessionManager{
 				.exec(session.getID());
 	}
 
-	private void updateInstanceInfo(String domain){
+	public void updateInstanceInfo(String domain){
 		new GetInstance()
 				.setCallback(new Callback<>(){
 					@Override
@@ -277,6 +279,7 @@ public class AccountSessionManager{
 										customEmojis.put(domain, groupCustomEmojis(emojis));
 										instancesLastUpdated.put(domain, emojis.lastUpdated);
 										MastodonAPIController.runInBackground(()->writeInstanceInfoFile(emojis, domain));
+										E.post(new EmojiUpdatedEvent(domain));
 									}
 
 									@Override

mastodon/src/main/java/org/joinmastodon/android/events/EmojiUpdatedEvent.java

@@ -0,0 +1,9 @@
+package org.joinmastodon.android.events;
+
+public class EmojiUpdatedEvent{
+	public String instanceDomain;
+
+	public EmojiUpdatedEvent(String instanceDomain){
+		this.instanceDomain=instanceDomain;
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/fragments/ComposeFragment.java

@@ -196,6 +196,9 @@ public class ComposeFragment extends ToolbarFragment implements OnBackPressedLis
 			Nav.finish(this);
 			return;
 		}
+		if(customEmojis.isEmpty()){
+			AccountSessionManager.getInstance().updateInstanceInfo(instanceDomain);
+		}
 
 		if(instance.maxTootChars>0)
 			charLimit=instance.maxTootChars;
@@ -546,7 +549,9 @@ public class ComposeFragment extends ToolbarFragment implements OnBackPressedLis
 	}
 
 	private void onCustomEmojiClick(Emoji emoji){
-		mainEditText.getText().replace(mainEditText.getSelectionStart(), mainEditText.getSelectionEnd(), ':'+emoji.shortcode+':');
+		int start=mainEditText.getSelectionStart();
+		String prefix=start>0 && !Character.isWhitespace(mainEditText.getText().charAt(start-1)) ? " :" : ":";
+		mainEditText.getText().replace(start, mainEditText.getSelectionEnd(), prefix+emoji.shortcode+':');
 	}
 
 	private void updateToolbar(){

mastodon/src/main/java/org/joinmastodon/android/ui/CustomEmojiPopupKeyboard.java

@@ -1,5 +1,6 @@
 package org.joinmastodon.android.ui;
 
+import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.res.TypedArray;
 import android.graphics.Rect;
@@ -11,7 +12,11 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import com.squareup.otto.Subscribe;
+
 import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.session.AccountSessionManager;
+import org.joinmastodon.android.events.EmojiUpdatedEvent;
 import org.joinmastodon.android.model.Emoji;
 import org.joinmastodon.android.model.EmojiCategory;
 import org.joinmastodon.android.ui.utils.UiUtils;
@@ -102,6 +107,15 @@ public class CustomEmojiPopupKeyboard extends PopupKeyboard{
 		this.listener=listener;
 	}
 
+	@SuppressLint("NotifyDataSetChanged")
+	@Subscribe
+	public void onEmojiUpdated(EmojiUpdatedEvent ev){
+		if(ev.instanceDomain.equals(domain)){
+			emojis=AccountSessionManager.getInstance().getCustomEmojis(domain);
+			adapter.notifyDataSetChanged();
+		}
+	}
+
 	private class SingleCategoryAdapter extends UsableRecyclerView.Adapter<RecyclerView.ViewHolder> implements ImageLoaderRecyclerAdapter{
 		private final EmojiCategory category;
 		private final List<ImageLoaderRequest> requests;