SI-8630 lineToString no longer long by one at eof

One more EOL crasher, or lack-of-EOL crasher, when the text
is at EOF.

It was not caught by the last round of excellent and
thorough tests because

```
// If non-whitespace tokens run all the way up to EOF,
// positions go wrong because the correct end of the last
// token cannot be used as an index into the char array.
// The least painful way to address this was to add a
// newline to the array.
```

1 files changed, 7 insertions, 0 deletions

diff --git a/test/files/neg/t8630.check b/test/files/neg/t8630.check
new file mode 100644
index 0000000000..98b084b153
--- /dev/null
+++ b/test/files/neg/t8630.check
@@ -0,0 +1,7 @@
+t8630.scala:1: error: '{' expected but 'abstract' found.
+package bobsdelights  abstract class Fruit(  val name: String,  val color: String  )  object Fruits {  object Apple extends Fruit("apple", "red")  object Orange extends Fruit("orange", "orange")  object Pear extends Fruit("pear", "yellowish")  val menu = List(Apple, Orange, Pear)  }
+                      ^
+t8630.scala:1: error: '}' expected but eof found.
+package bobsdelights  abstract class Fruit(  val name: String,  val color: String  )  object Fruits {  object Apple extends Fruit("apple", "red")  object Orange extends Fruit("orange", "orange")  object Pear extends Fruit("pear", "yellowish")  val menu = List(Apple, Orange, Pear)  }
+                                                                                                                                                                                                                                                                                           ^
+two errors found