From 06dd84d6da3b9cfe5d4ed3c274ee9659e7c68129 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 18 Feb 2024 12:59:07 +0530
Subject: [PATCH] Ensure event loop ticks ASAP when there is pending input

---
 kitty/child-monitor.c | 2 +-
 kitty/vt-parser.c     | 3 ++-
 kitty/vt-parser.h     | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/kitty/child-monitor.c b/kitty/child-monitor.c
index 454b73ede..54ef85586 100644
--- a/kitty/child-monitor.c
+++ b/kitty/child-monitor.c
@@ -443,7 +443,7 @@ do_parse(ChildMonitor *self, Screen *screen, monotonic_t now, bool flush) {
         if (screen->paused_rendering.expires_at) {
             set_maximum_wait(MAX(0, screen->paused_rendering.expires_at - now));
         } else set_maximum_wait(OPT(input_delay) - pd.time_since_new_input);
-    }
+    } else if (pd.has_pending_input) set_maximum_wait(OPT(input_delay) - pd.time_since_new_input);
     return pd.input_read;
 }
 
diff --git a/kitty/vt-parser.c b/kitty/vt-parser.c
index 1c69ff1a8..6a160763a 100644
--- a/kitty/vt-parser.c
+++ b/kitty/vt-parser.c
@@ -1384,7 +1384,8 @@ run_worker(void *p, ParseData *pd, bool flush) {
     PS *self = (PS*)screen->vt_parser->state;
     with_lock {
         self->read.sz += self->write.pending; self->write.pending = 0;
-        if (self->read.pos < self->read.sz) {
+        pd->has_pending_input = self->read.pos < self->read.sz;
+        if (pd->has_pending_input) {
             pd->time_since_new_input = pd->now - self->new_input_at;
             if (flush || pd->time_since_new_input >= OPT(input_delay) || self->read.sz + 16 * 1024 > BUF_SZ) {
                 pd->input_read = true;
diff --git a/kitty/vt-parser.h b/kitty/vt-parser.h
index 7d0a15d36..141a4daa7 100644
--- a/kitty/vt-parser.h
+++ b/kitty/vt-parser.h
@@ -20,7 +20,7 @@ typedef struct ParseData {
     PyObject *dump_callback;
     monotonic_t now;
 
-    bool input_read, write_space_created;
+    bool input_read, write_space_created, has_pending_input;
     monotonic_t time_since_new_input;
 } ParseData;