From f39ab3875efc2432d94fedf5bcecee08c40161e6 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Fri, 29 Mar 2019 15:02:31 +0900
Subject: [PATCH] Redraw prompt only when necessary

---
 src/terminal.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/terminal.go b/src/terminal.go
index 1741b4d..ca811c4 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -1635,7 +1635,8 @@ func (t *Terminal) Loop() {
 
 		t.mutex.Lock()
 		previousInput := t.input
-		events := []util.EventType{reqPrompt}
+		previousCx := t.cx
+		events := []util.EventType{}
 		req := func(evts ...util.EventType) {
 			for _, event := range evts {
 				events = append(events, event)
@@ -1996,7 +1997,6 @@ func (t *Terminal) Loop() {
 			t.jumping = jumpDisabled
 			req(reqList)
 		}
-		t.mutex.Unlock() // Must be unlocked before touching reqBox
 
 		if changed {
 			if t.isPreviewEnabled() {
@@ -2007,6 +2007,12 @@ func (t *Terminal) Loop() {
 			}
 			t.eventBox.Set(EvtSearchNew, t.sort)
 		}
+
+		if changed || t.cx != previousCx {
+			req(reqPrompt)
+		}
+
+		t.mutex.Unlock() // Must be unlocked before touching reqBox
 		for _, event := range events {
 			t.reqBox.Set(event, nil)
 		}