Kitty image support improvements

* Use `--unicode-placeholder` for consistent result in and out of tmux
* Use updated version of junegunn/go-runewidth that handles diacritics
  used in Kitty Unicode placeholder

Close #3567

5 files changed, 6 insertions, 6 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f66e0a09..25cabe8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -124,7 +124,7 @@ CHANGELOG
       # --transfer-mode=memory is the fastest option but if you want fzf to be able
       # to redraw the image on terminal resize or on 'change-preview-window',
       # you need to use --transfer-mode=stream.
-      kitty icat --clear --transfer-mode=memory --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {} | sed \$d
+      kitty icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {} | sed \$d
     else
       bat --color=always {}
     fi
diff --git a/README.md b/README.md
index 04da4a4c..55a3dba9 100644
--- a/README.md
+++ b/README.md
@@ -741,7 +741,7 @@ Kitty, you can make fzf display an image in the preview window.
 ```sh
 fzf --preview='
   if file --mime-type {} | grep -qF image/; then
-    kitty icat --clear --transfer-mode=memory --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {} | sed \$d
+    kitty icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}@0x0 {} | sed \$d
   else
     bat --color=always {}
   fi
diff --git a/bin/fzf-preview.sh b/bin/fzf-preview.sh
index 09cdda7c..13beef8f 100755
--- a/bin/fzf-preview.sh
+++ b/bin/fzf-preview.sh
@@ -53,7 +53,7 @@ if [[ $KITTY_WINDOW_ID ]]; then
   # 2. The last line of the output is the ANSI reset code without newline.
   #    This confuses fzf and makes it render scroll offset indicator.
   #    So we remove the last line and append the reset code to its previous line.
-  kitty icat --clear --transfer-mode=memory --stdin=no --place="$dim@0x0" "$file" | sed '$d' | sed $'$s/$/\e[m/'
+  kitty icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed '$d' | sed $'$s/$/\e[m/'
 
 # 2. Use chafa with Sixel output
 elif command -v chafa > /dev/null; then
diff --git a/go.mod b/go.mod
index d5ff7758..ed4efda6 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module github.com/junegunn/fzf
 
 require (
 	github.com/gdamore/tcell/v2 v2.5.4
-	github.com/junegunn/go-runewidth v0.0.0-20240114080738-1b95d8d53ad8
+	github.com/junegunn/go-runewidth v0.0.15-0.20240116150947-31c2dd15ab48
 	github.com/mattn/go-isatty v0.0.17
 	github.com/mattn/go-shellwords v1.0.12
 	github.com/rivo/uniseg v0.4.4
diff --git a/go.sum b/go.sum
index 00432fac..3831511f 100644
--- a/go.sum
+++ b/go.sum
@@ -2,8 +2,8 @@ github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdk
 github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
 github.com/gdamore/tcell/v2 v2.5.4 h1:TGU4tSjD3sCL788vFNeJnTdzpNKIw1H5dgLnJRQVv/k=
 github.com/gdamore/tcell/v2 v2.5.4/go.mod h1:dZgRy5v4iMobMEcWNYBtREnDZAT9DYmfqIkrgEMxLyw=
-github.com/junegunn/go-runewidth v0.0.0-20240114080738-1b95d8d53ad8 h1:qcSgFcU7GG0oYYbUzJJvv2AcJRPzjVZLwrL4ZahMpOw=
-github.com/junegunn/go-runewidth v0.0.0-20240114080738-1b95d8d53ad8/go.mod h1:Mq6NazeZhIIQPMFoInCi35AktcN/MuW2elHsDK5N52w=
+github.com/junegunn/go-runewidth v0.0.15-0.20240116150947-31c2dd15ab48 h1:546WmTZE4BUDJXhKlsaqhgdAPt+yWp82cNkzJxsvVDQ=
+github.com/junegunn/go-runewidth v0.0.15-0.20240116150947-31c2dd15ab48/go.mod h1:Mq6NazeZhIIQPMFoInCi35AktcN/MuW2elHsDK5N52w=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=