ui/tui: highlighting refactor

Make HlAttr contain highlighting state for both color modes (cterm and rgb).
This allows us to implement termguicolors completely in the TUI.

Simplify some logic duplicated between ui.c and screen.c. Also avoid
some superfluous highlighting reset events.

1 files changed, 3 insertions, 4 deletions

diff --git a/src/nvim/ugrid.c b/src/nvim/ugrid.c
index e0880b4c76..6d420ef2f8 100644
--- a/src/nvim/ugrid.c
+++ b/src/nvim/ugrid.c
@@ -17,7 +17,7 @@
 void ugrid_init(UGrid *grid)
 {
   grid->attrs = HLATTRS_INIT;
-  grid->fg = grid->bg = -1;
+  grid->clear_attrs = HLATTRS_INIT;
   grid->cells = NULL;
 }
 
@@ -107,6 +107,7 @@ UCell *ugrid_put(UGrid *grid, uint8_t *text, size_t size)
   UCell *cell = grid->cells[grid->row] + grid->col;
   cell->data[size] = 0;
   cell->attrs = grid->attrs;
+  assert(size <= CELLBYTES);
 
   if (text) {
     memcpy(cell->data, text, size);
@@ -118,9 +119,7 @@ UCell *ugrid_put(UGrid *grid, uint8_t *text, size_t size)
 
 static void clear_region(UGrid *grid, int top, int bot, int left, int right)
 {
-  HlAttrs clear_attrs = HLATTRS_INIT;
-  clear_attrs.foreground = grid->fg;
-  clear_attrs.background = grid->bg;
+  HlAttrs clear_attrs = grid->clear_attrs;
   UGRID_FOREACH_CELL(grid, top, bot, left, right, {
     cell->data[0] = ' ';
     cell->data[1] = 0;