fix hint not ellipsizing

Closes #3672
// FREEBIE

src/org/thoughtcrime/securesms/components/ComposeText.java

@@ -6,6 +6,7 @@ import android.support.v7.widget.AppCompatEditText;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.TextUtils;
+import android.text.TextUtils.TruncateAt;
 import android.text.style.RelativeSizeSpan;
 import android.util.AttributeSet;
 
@@ -24,6 +25,16 @@ public class ComposeText extends EmojiEditText {
     super(context, attrs, defStyleAttr);
   }
 
+  @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+    super.onLayout(changed, left, top, right, bottom);
+    if (!TextUtils.isEmpty(getHint())) {
+      setHint(TextUtils.ellipsize(getHint(),
+                                  getPaint(),
+                                  getWidth() - getPaddingLeft() - getPaddingRight(),
+                                  TruncateAt.END));
+    }
+  }
+
   public void setHint(@NonNull String hint) {
     SpannableString span = new SpannableString(hint);
     span.setSpan(new RelativeSizeSpan(0.8f), 0, hint.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);