From 98f80717e8941cf39bb4ac09ba343d56afe8d46e Mon Sep 17 00:00:00 2001
From: faiface <faiface2202@gmail.com>
Date: Tue, 7 May 2019 01:12:30 +0200
Subject: mux: fix not delivering resize correctly sometimes

---
 mux.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mux.go b/mux.go
index 1ee43bf..351ade2 100644
--- a/mux.go
+++ b/mux.go
@@ -8,6 +8,8 @@ import (
 
 type Mux struct {
 	mu        sync.Mutex
+	haveR     bool
+	r         image.Rectangle
 	eventsIns []chan<- Event
 	draw      chan<- func(draw.Image) image.Rectangle
 }
@@ -26,6 +28,13 @@ func NewMux(env Env) (mux *Mux, master Env) {
 
 	go func() {
 		for e := range env.Events() {
+			var minX, minY, maxX, maxY int
+			if e.Matches("resize/%d/%d/%d/%d", &minX, &minY, &maxX, &maxY) {
+				mux.mu.Lock()
+				mux.r = image.Rect(minX, minY, maxX, maxY)
+				mux.haveR = true
+				mux.mu.Unlock()
+			}
 			mux.mu.Lock()
 			for _, eventsIn := range mux.eventsIns {
 				eventsIn <- e
@@ -61,6 +70,10 @@ func (mux *Mux) makeEnv(master bool) Env {
 
 	mux.mu.Lock()
 	mux.eventsIns = append(mux.eventsIns, eventsIn)
+	// make sure to always send a resize event to a new Env if we got it already
+	if mux.haveR {
+		eventsIn <- Eventf("resize/%d/%d/%d/%d", mux.r.Min.X, mux.r.Min.Y, mux.r.Max.X, mux.r.Max.Y)
+	}
 	mux.mu.Unlock()
 
 	go func() {
-- 
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