icat kitten: When catting multiple images display the images in input order

Fixes #9413

docs/changelog.rst

@@ -200,6 +200,8 @@ Detailed list of changes
 - Linux: Fix a regression in 0.40 that caused horizontal alignment for emoji to
   be incorrect in some cases (:iss:`9395`)
 
+- icat kitten: When catting multiple images display the images in input order (:iss:`9413`)
+
 
 0.45.0 [2025-12-24]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

kittens/icat/main.go

@@ -7,6 +7,7 @@ import (
 	"math"
 	"os"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync/atomic"
@@ -256,7 +257,8 @@ func main(cmd *cli.Command, o *Options, args []string) (rc int, err error) {
 		return 1, fmt.Errorf("The --place option can only be used with a single image, not %d", len(items))
 	}
 	files_channel = make(chan input_arg, len(items))
-	for _, ia := range items {
+	for i, ia := range items {
+		ia.index = i
 		files_channel <- ia
 	}
 	num_of_items = len(items)
@@ -320,8 +322,10 @@ func main(cmd *cli.Command, o *Options, args []string) (rc int, err error) {
 		use_unicode_placeholder = true
 	}
 	base_id := uint32(opts.ImageId)
-	for num_of_items > 0 {
-		imgd := <-output_channel
+	expecting_input_sequence_number := 0
+	pending := make([]*image_data, 0, num_of_items)
+
+	do_one := func(imgd *image_data) {
 		if base_id != 0 {
 			imgd.image_id = base_id
 			base_id++
@@ -341,6 +345,26 @@ func main(cmd *cli.Command, o *Options, args []string) (rc int, err error) {
 			}
 		}
 	}
+
+	for num_of_items > 0 {
+		imgd := <-output_channel
+		if imgd.input_sequence_number == expecting_input_sequence_number {
+			do_one(imgd)
+			expecting_input_sequence_number++
+		} else {
+			pending = append(pending, imgd)
+			index, _ := slices.BinarySearchFunc(pending, imgd.input_sequence_number, func(x *image_data, n int) int {
+				return x.input_sequence_number - n
+			})
+			pending = slices.Insert(pending, index, imgd)
+		}
+		for len(pending) > 0 && pending[0].input_sequence_number == expecting_input_sequence_number {
+			do_one(pending[0])
+			pending = pending[1:]
+		}
+	}
+	if len(pending) > 0 {
+	}
 	keep_going.Store(false)
 	if opts.Hold {
 		fmt.Print("\r")

kittens/icat/process_images.go

@@ -28,6 +28,7 @@ type input_arg struct {
 	arg         string
 	value       string
 	is_http_url bool
+	index       int
 }
 
 func is_http_url(arg string) bool {
@@ -113,6 +114,7 @@ type image_data struct {
 	width_cells, height_cells         int
 	use_unicode_placeholder           bool
 	passthrough_mode                  passthrough_type
+	input_sequence_number             int
 
 	// for error reporting
 	err         error
@@ -293,7 +295,7 @@ func process_arg(arg input_arg) {
 	case "magick":
 		dopts = append(dopts, imaging.Backends(imaging.MAGICK_IMAGE))
 	}
-	imgd := image_data{source_name: arg.value}
+	imgd := image_data{source_name: arg.value, input_sequence_number: arg.index}
 	dopts = append(dopts, imaging.ResizeCallback(func(w, h int) (int, int) {
 		imgd.canvas_width, imgd.canvas_height = w, h
 		set_basic_metadata(&imgd)

kitty_tests/mouse.py

@@ -261,6 +261,13 @@ class TestMouse(BaseTest):
         scroll(x=2.6, up=False)
         self.ae(sel(), '3')
         release()
+        # fractional scrolling
+        init()
+        s.fractional_scroll(-0.5)
+        press()
+        move(x=3.6, q='1234')
+        release(x=3.6)
+        self.ae(sel(), '1234')
 
         # extending selections
         init()