Don't shorten message footers for mixed-direction text.

app/src/test/java/org/thoughtcrime/securesms/util/StringUtilTest_hasMixedTextDirection.java

@@ -0,0 +1,49 @@
+package org.thoughtcrime.securesms.util;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Parameterized.class)
+public final class StringUtilTest_hasMixedTextDirection {
+
+  private final CharSequence input;
+  private final boolean      expected;
+
+  @Parameterized.Parameters
+  public static Collection<Object[]> data() {
+    return Arrays.asList(new Object[][]{
+      { "",        false },
+      { null,      false },
+      { "A",       false},
+      { "ة",       false},  // Arabic
+      { "ی",       false},  // Kurdish
+      { "ی",       false }, // Farsi
+      { "و",       false }, // Urdu
+      { "ת",       false }, // Hebrew
+      { "ש",       false }, // Yiddish
+      { "Aة",       true }, // Arabic-ASCII
+      { "یA",       true }, // Kurdish-ASCII
+      { "Aی",       true }, // Farsi-ASCII
+      { "وA",       true }, // Urdu-ASCII
+      { "Aת",       true }, // Hebrew-ASCII
+      { "שA",       true }, // Yiddish-ASCII
+    });
+  }
+
+  public StringUtilTest_hasMixedTextDirection(CharSequence input, boolean expected) {
+    this.input    = input;
+    this.expected = expected;
+  }
+
+  @Test
+  public void trim() {
+    boolean output = StringUtil.hasMixedTextDirection(input);
+    assertEquals(expected, output);
+  }
+}