Render invisible attribute

Implement invisible mode by setting the foreground color to be the same
as the background color. Not rendering anything would also be an
alternative, but this seems less likely to cause surprises in
conjunction with any hacks.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/st.c b/st.c
index 9637834..a69cc9e 100644
--- a/st.c
+++ b/st.c
@@ -3236,6 +3236,9 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
                 fg = bg;
 
+        if(base.mode & ATTR_INVISIBLE)
+                fg = bg;
+
         /* Intelligent cleaning up of the borders. */
         if(x == 0) {
                 xclear(0, (y == 0)? 0 : winy, borderpx,