Real-image posters: blocks while the window is being resized; ARR_TUI_DEBUG_GFX log

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/ui/kitty_test.go

@@ -10,6 +10,7 @@ import (
 	"regexp"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/rivo/tview"
@@ -318,3 +319,52 @@ func TestPosterSource(t *testing.T) {
 		}
 	}
 }
+
+func TestGraphicsAreHeldWhileTheWindowChanges(t *testing.T) {
+	sim := tcell.NewSimulationScreen("")
+	if err := sim.Init(); err != nil {
+		t.Fatal(err)
+	}
+	defer sim.Fini()
+	sim.SetSize(40, 20)
+	screen := trueColor{sim}
+
+	rec := &recorder{}
+	k := newKittyGraphics(rec.write)
+	c := newCoverView(quadrantStyle, k, nil)
+	c.setImage(stripes(40, 60))
+	c.SetRect(0, 0, 30, 10)
+
+	k.hold()
+	if !k.settling() {
+		t.Fatal("hold must start the settling period")
+	}
+	c.Draw(screen)
+	if len(rec.cmds) != 0 {
+		t.Fatalf("graphics commands while the window changes: %q", rec.cmds)
+	}
+	if ch, _, _, _ := sim.GetContent(29, 9); ch == placeholderRune {
+		t.Error("placeholders drawn while settling; blocks are the stand-in")
+	}
+
+	k.holdUntil = time.Now().Add(-time.Millisecond) // the period is over
+	c.Draw(screen)
+	if len(rec.cmds) != 2 {
+		t.Errorf("after settling: %d commands, want upload + placement", len(rec.cmds))
+	}
+	if ch, _, _, _ := sim.GetContent(29, 9); ch != placeholderRune {
+		t.Error("real image not shown after settling")
+	}
+}
+
+func TestGraphicsDebugReportsUploads(t *testing.T) {
+	rec := &recorder{}
+	k := newKittyGraphics(rec.write)
+	var lines []string
+	k.debug = func(s string) { lines = append(lines, s) }
+	img := noisy(10, 15)
+	k.show(img, img.Bounds(), 12, 8)
+	if len(lines) != 1 || !strings.Contains(lines[0], "id 1") || !strings.Contains(lines[0], "12x8 cells") || !strings.Contains(lines[0], "10x15 px") {
+		t.Errorf("debug lines = %q", lines)
+	}
+}