[vte/wip/egmont/bidi: 83/91] ring lookup fix

[Egmont Koblinger <egmontkob src gnome org>]

commit cbf4f92442c770e4eb5718f1c47da28777ab4198
Author: Egmont Koblinger <egmont gmail com>
Date:   Fri Dec 7 14:07:52 2018 +0100

    ring lookup fix

 src/bidi.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/bidi.cc b/src/bidi.cc
index 2bf6c320..3f2f3030 100644
--- a/src/bidi.cc
+++ b/src/bidi.cc
@@ -334,8 +334,8 @@ vte::grid::row_t RingView::paragraph(vte::grid::row_t row)
                         break;
         }
 
-        if (lines == 0) {
-                // huh?
+        if (line == 0) {
+                /* Beyond the end of the ring. */
                 return explicit_paragraph (row_orig, rtl);
         }
 
@@ -382,7 +382,7 @@ vte::grid::row_t RingView::paragraph(vte::grid::row_t row)
                 line = m_start - row;
                 row = m_start;
         }
-        while (row < m_start + m_len) {
+        while (row < _vte_ring_next(m_ring) && row < m_start + m_len) {
                 bidirow = get_row_map_writable(row);
                 bidirow->m_base_rtl = rtl;
                 bidirow->m_has_foreign = true;