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ui: disable clearing almost everywhere

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Avoid clearing the screen in most situations. NOT_VALID should be
equivalent to CLEAR unless some external force messed up the terminal,
for these situations <c-l> and :mode will still clear the screen.

Also eliminate some obsolete code in screen.c, that dealt with that in
vim drawing window 1 can mess up window 2, but this never happens in
nvim.

But what about slow terminals? There is two common meanings in which
a terminal is said to be "slow":

Most commonly (and in the sense of vim:s nottyfast) it means low
bandwidth for sending bytes from nvim to the terminal. If the screen is
very similar before and after the update_screen(CLEAR) this change
should reduce bandwidth. If the screen is quite different, but there is
no new regions of contiguous whitespace, clearing doesn't reduce
bandwidth significantly. If the new screen contains a lot of whitespace,
it will depend of if vsplits are used or not: as long as there is no
vsplits, ce is used to cheaply clear the rest of the line, so
full-screen clear is not needed to reduce bandwith. However a left
vsplit currently needs to be padded with whitespace all the way to the
separator. It is possible ec (clear N chars) can be used to reduce
bandwidth here if this is a problem. (All of this assumes that one
doesn't set Normal guibg=... on a non-BCE terminal, if you do you are
doomed regardless of this change).

Slow can also mean that drawing pixels on the screen is slow. E-ink
screens is a recent example. Avoiding clearing and redrawing the
unchanged part of the screen will always improve performance in these
cases.
This commit is contained in:
Björn Linse
2018-10-20 23:43:47 +02:00
parent 565bbd1485
commit e598811e76
18 changed files with 119 additions and 185 deletions
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16
src/nvim/message.c
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@@ -832,12 +832,11 @@ void msg_end_prompt(void)
lines_left = -1;
}
/*
* wait for the user to hit a key (normally a return)
* if 'redraw' is TRUE, clear and redraw the screen
* if 'redraw' is FALSE, just redraw the screen
* if 'redraw' is -1, don't redraw at all
*/
/// wait for the user to hit a key (normally a return)
///
/// if 'redraw' is true, redraw the entire screen NOT_VALID
/// if 'redraw' is false, do a normal redraw
/// if 'redraw' is -1, don't redraw at all
void wait_return(int redraw)
{
int c;
@@ -847,8 +846,9 @@ void wait_return(int redraw)
int save_Recording;
FILE *save_scriptout;
if (redraw == TRUE)
must_redraw = CLEAR;
if (redraw == true) {
redraw_all_later(NOT_VALID);
}
/* If using ":silent cmd", don't wait for a return. Also don't set
* need_wait_return to do it later. */