ui: use line-based rather than char-based updates in screen.c

Add ext_newgrid and ext_hlstate extensions. These use predefined
highlights and line-segment based updates, for efficiency and
simplicity.. The ext_hlstate extension in addition allows semantic
identification of builtin and syntax highlights.

Reimplement the old char-based updates in the remote UI layer, for
compatibility. For the moment, this is still the default. The bulitin
TUI uses the new line-based protocol.

cmdline uses curwin cursor position when ext_cmdline is active.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/nvim/lib/kvec.h b/src/nvim/lib/kvec.h
index 6d54c7f78d..93b2f053bc 100644
--- a/src/nvim/lib/kvec.h
+++ b/src/nvim/lib/kvec.h
@@ -98,14 +98,14 @@
     (*kv_pushp(v) = (x))
 
 #define kv_a(v, i) \
-    (((v).capacity <= (size_t) (i) \
+    (*(((v).capacity <= (size_t) (i) \
       ? ((v).capacity = (v).size = (i) + 1, \
          kv_roundup32((v).capacity), \
-         kv_resize((v), (v).capacity), 0) \
+         kv_resize((v), (v).capacity), 0UL) \
       : ((v).size <= (size_t) (i) \
          ? (v).size = (i) + 1 \
-         : 0)), \
-     (v).items[(i)])
+         : 0UL)), \
+     &(v).items[(i)]))
 
 /// Type of a vector with a few first members allocated on stack
 ///