patch 8.0.1523: cannot write and read terminal screendumps
Problem: Cannot write and read terminal screendumps.
Solution: Add term_dumpwrite(), term_dumpread() and term_dumpdiff().
Also add assert_equalfile().
diff --git a/src/normal.c b/src/normal.c
index 31ec363..c234c32 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -7474,6 +7474,11 @@
static void
nv_subst(cmdarg_T *cap)
{
+#ifdef FEAT_TERMINAL
+ /* When showing output of term_dumpdiff() swap the top and botom. */
+ if (term_swap_diff() == OK)
+ return;
+#endif
if (VIsual_active) /* "vs" and "vS" are the same as "vc" */
{
if (cap->cmdchar == 'S')