vt(4): When creating a window buffer, fill it entirely

... not just the visible part.

This fixes a bug where, when switching from eg. vt_vga to vt_fb (ie. the
resolution goes up), the originally hidden, uninitialized area of the
buffer is displayed on the screen. This leads to a missing text cursor
when it's over an unitialized area.

This was also visible when selecting text: the uninitialized area was
not highlighted.

Internally, this area was zeroed: characters were all 0x00000000,
meaning the foreground and background color was black. Now, everything
is filled with a space with a gray foreground color, like the visible
area.

While here, remove the check for the mute flag and always use
TERMINAL_NORM_ATTR as the character attribute (ie. gray foreground,
black background).

MFC after:	1 week

1 files changed, 3 insertions, 3 deletions

diff --git a/sys/dev/vt/vt_buf.c b/sys/dev/vt/vt_buf.c
index 80fcd48..1c76ea5a 100644
--- a/sys/dev/vt/vt_buf.c
+++ b/sys/dev/vt/vt_buf.c
@@ -410,9 +410,9 @@ vtbuf_init_early(struct vt_buf *vb)
 
 	vtbuf_init_rows(vb);
 	rect.tr_begin.tp_row = rect.tr_begin.tp_col = 0;
-	rect.tr_end = vb->vb_scr_size;
-	vtbuf_fill(vb, &rect, VTBUF_SPACE_CHAR((boothowto & RB_MUTE) == 0 ?
-	    TERMINAL_KERN_ATTR : TERMINAL_NORM_ATTR));
+	rect.tr_end.tp_col = vb->vb_scr_size.tp_col;
+	rect.tr_end.tp_row = vb->vb_history_size;
+	vtbuf_fill(vb, &rect, VTBUF_SPACE_CHAR(TERMINAL_NORM_ATTR));
 	vtbuf_make_undirty(vb);
 	if ((vb->vb_flags & VBF_MTX_INIT) == 0) {
 		mtx_init(&vb->vb_lock, "vtbuf", NULL, MTX_SPIN);