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screen: initialize screen properly with early set display-=msgsep

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Currently `nvim -u NORC --cmd "set display-=msgsep"` will still allocate the
message grid and remove it just afterwards. While inefficient, we must
make sure update_screen() re-validates the default_grid completely when
this happens.

Fix some invalid logic: don't reallocate msg_grid on resize when the grid is not
used.

Elide a too early ui_flush() on startup, which caused an invalid cursor
position to be used.
This commit is contained in:
Björn Linse
2019-09-02 10:46:24 +02:00
parent 099445cc07
commit 66f4e8aee0
3 changed files with 19 additions and 5 deletions
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4
src/nvim/message.c
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@@ -154,8 +154,8 @@ void msg_grid_validate(void)
{
grid_assign_handle(&msg_grid);
bool should_alloc = msg_dothrottle();
if (msg_grid.Rows != Rows || msg_grid.Columns != Columns
|| (should_alloc && !msg_grid.chars)) {
if (should_alloc && (msg_grid.Rows != Rows || msg_grid.Columns != Columns
|| !msg_grid.chars)) {
// TODO(bfredl): eventually should be set to "invalid". I e all callers
// will use the grid including clear to EOS if necessary.
grid_alloc(&msg_grid, Rows, Columns, false, true);