BufferView: user must call update() after all changes and before vert_iter()

test/src/test_BufferView.cc

@@ -63,6 +63,7 @@ TEST(BufferViewTest, does_not_iterate_for_empty_buffer)
     BufferView bv(b, iterator, Cwd);
     bv.resize(40, 8);
     int iter_count = 0;
+    bv.update();
     for (auto it = bv.vert_iter(); it.is_valid(); it++)
     {
         iter_count++;
@@ -80,6 +81,7 @@ TEST(BufferViewTest, iterates_through_screen_lines_with_no_wrapping)
     BufferView bv(b, iterator, Cwd);
     bv.resize(40, 8);
     int iter_count = 0;
+    bv.update();
     for (auto it = bv.vert_iter(); it.is_valid(); it++)
     {
         EXPECT_EQ(iter_count, LineNumber(it.iterator()));
@@ -99,6 +101,7 @@ TEST(BufferViewTest, iterates_through_screen_lines_with_wrapping)
     bv.resize(3, 10);
     int iter_count = 0;
     int expected_row_offsets[] = {0, 1, 2, 4, 5, 6, 7};
+    bv.update();
     for (auto it = bv.vert_iter(); it.is_valid(); it++)
     {
         EXPECT_EQ(iter_count, LineNumber(it.iterator()));
@@ -122,6 +125,7 @@ TEST(BufferViewTest, fills_view_with_last_lines_of_buffer_when_cursor_warps_to_l
     bv.resize(40, 3);
     int iter_count = 0;
     int expected_row_offsets[] = {0, 1, 2};
+    bv.update();
     for (auto it = bv.vert_iter(); it.is_valid(); it++)
     {
         EXPECT_EQ(10 + iter_count, LineNumber(it.iterator()));