term: optimize canvas redraw, remove emulate-overline

* Replaced the `pcanvas' comparison with a much simpler tracking of
  the first damaged cell in writeGrid, which is significantly faster.
* Removed emulate-overline: it's of too little utility compared to the
  maintenance burden it caused.

1 files changed, 0 insertions, 9 deletions

diff --git a/doc/cha-config.5 b/doc/cha-config.5
index 450087bc..2466c3de 100644
--- a/doc/cha-config.5
+++ b/doc/cha-config.5
@@ -429,15 +429,6 @@ Disable specified formatting modes.
 T}@T{
 T}
 T{
-emulate\-overline
-T}@T{
-boolean
-T}@T{
-When set to true and the overline formatting attribute is not enabled,
-overlines are substituted by underlines on the previous line.
-T}@T{
-T}
-T{
 alt\-screen
 T}@T{
 \[lq]auto\[rq] / boolean