Posters: re-place after a resize, measure cell size without padding, log failed posters

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

internal/ui/kitty_test.go

@@ -279,3 +279,51 @@ func TestCropToBox(t *testing.T) {
 		t.Errorf("offset image: %v", got)
 	}
 }
+
+func TestInvalidateReplacesPlacements(t *testing.T) {
+	rec := &recorder{}
+	k := newKittyGraphics(rec.write)
+	k.place(3, 17, 13)
+	k.place(4, 10, 8)
+	rec.cmds = nil
+	k.invalidate()
+	if len(rec.cmds) != 2 || !strings.Contains(strings.Join(rec.cmds, ""), "a=d,d=i,i=3") || !strings.Contains(strings.Join(rec.cmds, ""), "a=d,d=i,i=4") {
+		t.Fatalf("invalidate sent %q", rec.cmds)
+	}
+	// The same size is placed again afterwards, since the placement is gone.
+	rec.cmds = nil
+	k.place(3, 17, 13)
+	if len(rec.cmds) != 1 || !strings.Contains(rec.cmds[0], "a=p,U=1,i=3,c=17,r=13") {
+		t.Errorf("after invalidate: %q", rec.cmds)
+	}
+}
+
+func TestCellAspectFromWindow(t *testing.T) {
+	// 140×50 cells of 9×20 px plus 4 and 11 px of padding: plain division
+	// would say 1264/140=9.03 and 1011/50=20.22 (aspect 2.24), the real shape is 20/9.
+	if got := cellAspectFromWindow(140, 50, 140*9+4, 50*20+11); math.Abs(got-20.0/9) > 1e-9 {
+		t.Errorf("aspect = %v, want %v", got, 20.0/9)
+	}
+	// Padding that grows with the window does not move it.
+	for _, pad := range []int{0, 3, 8} {
+		if got := cellAspectFromWindow(100, 30, 100*10+pad, 30*21+pad); math.Abs(got-2.1) > 1e-9 {
+			t.Errorf("padding %d: aspect = %v", pad, got)
+		}
+	}
+	for _, bad := range [][4]int{{0, 10, 100, 100}, {10, 0, 100, 100}, {10, 10, 0, 100}, {10, 10, 100, 0}, {100, 100, 50, 50}} {
+		if got := cellAspectFromWindow(bad[0], bad[1], bad[2], bad[3]); got != 2 {
+			t.Errorf("%v: aspect = %v, want the default 2", bad, got)
+		}
+	}
+}
+
+func TestPosterSource(t *testing.T) {
+	for in, want := range map[string]string{
+		"https://artworks.thetvdb.com/banners/posters/1-1.jpg":    "artworks.thetvdb.com/banners/posters/1-1.jpg",
+		"http://radarr:7878|/MediaCover/1/poster.jpg?lastWrite=5": "/MediaCover/1/poster.jpg",
+	} {
+		if got := posterSource(in); got != want {
+			t.Errorf("posterSource(%q) = %q, want %q", in, got, want)
+		}
+	}
+}