vcr: make vcr_shift_below_row_up_one() assert unconditionalHEADmaster

This assert has proven interesting, but sticking it in the mem
backend limits its exercising to headless.  I mostly run this on
Xlib in vwm/vmon, and it's proving annoying to trigger this
assert outside of embedded headless scenarios.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/vcr.c b/src/vcr.c
index fe13292..0c01d03 100644
--- a/src/vcr.c
+++ b/src/vcr.c
@@ -1361,6 +1361,8 @@ void vcr_shift_below_row_up_one(vcr_t *vcr, int row)
 	if ((row + 1) * VCR_ROW_HEIGHT >= vcr->height)
 		return;
 
+	assert(*(vcr->hierarchy_end_ptr) >= row);
+
 	switch (vcr->backend->type) {
 #ifdef USE_XLIB
 	case VCR_BACKEND_TYPE_XLIB: {