tr: fix order inside class [:blank:]

src/uu/tr/src/unicode_table.rs

@@ -12,4 +12,4 @@ pub static FF: u8 = 0xC;
 pub static CR: u8 = 0xD;
 pub static SPACE: u8 = 0x20;
 pub static SPACES: &[u8] = &[HT, LF, VT, FF, CR, SPACE];
-pub static BLANK: &[u8] = &[SPACE, HT];
+pub static BLANK: &[u8] = &[HT, SPACE];

tests/by-util/test_tr.rs

@@ -1299,3 +1299,17 @@ fn check_regression_class_space() {
         .no_stderr()
         .stdout_only("a123456b");
 }
+
+#[test]
+fn check_regression_class_blank() {
+    // This invocation checks:
+    // 1. that the [:blank:] class has exactly 2 characters,
+    // 2. that the [:blank:] class contains at least the given 2 characters (and therefore no other characters), and
+    // 3. that the given characters occur in exactly this order.
+    new_ucmd!()
+        .args(&["[:blank:][:upper:]", "12[:lower:]"])
+        .pipe_in("A\t B")
+        .succeeds()
+        .no_stderr()
+        .stdout_only("a12b");
+}