From ecf7f0cab0bf53a36ccb634e434c84e914ea25af Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 2 Sep 2025 11:29:55 +0530
Subject: [PATCH] kitten diff: Fix incorrect rendering if diff completes before
 terminal responds to capabilities query

---
 kittens/diff/ui.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/kittens/diff/ui.go b/kittens/diff/ui.go
index 4c0738c4e..82456a3a4 100644
--- a/kittens/diff/ui.go
+++ b/kittens/diff/ui.go
@@ -287,7 +287,7 @@ func (self *Handler) resize_all_images_if_needed() {
 }
 
 func (self *Handler) rerender_diff() error {
-	if self.diff_map != nil && self.collection != nil {
+	if self.diff_map != nil && self.collection != nil && self.terminal_capabilities_received {
 		err := self.render_diff()
 		if err != nil {
 			return err
@@ -305,6 +305,13 @@ func (self *Handler) handle_async_result(r AsyncResult) error {
 		self.highlight_all()
 		self.load_all_images()
 	case DIFF:
+		if !self.terminal_capabilities_received {
+			go func() {
+				self.async_results <- r
+				self.lp.WakeupMainThread()
+			}()
+			return nil
+		}
 		self.diff_map = r.diff_map
 		self.calculate_statistics()
 		self.clear_mouse_selection()
@@ -333,7 +340,7 @@ func (self *Handler) handle_async_result(r AsyncResult) error {
 func (self *Handler) on_resize(old_size, new_size loop.ScreenSize) error {
 	self.clear_mouse_selection()
 	self.update_screen_size(new_size)
-	if self.diff_map != nil && self.collection != nil {
+	if self.diff_map != nil && self.collection != nil && self.terminal_capabilities_received {
 		err := self.render_diff()
 		if err != nil {
 			return err