Split Border Color Ignored on Initial Startup

[jackplus-xyz]

Describe the bug
The split border color in Kitty terminal does not respect the inactive_border_color setting from theme configuration files on initial startup.

Expected Behavior

• Split borders should use the color specified in inactive_border_color from the appropriate theme file immediately upon startup.

Actual Behavior

• On startup: Split borders use the default color instead of the configured inactive_border_color
• After theme switch: Split borders correctly use the configured inactive_border_color

To Reproduce
Steps to reproduce the behavior:

1. Configure theme files:

   • Edit all theme files (dark-theme.auto.conf, light-theme.auto.conf, no-preference-theme.auto.conf)
   • Set inactive_border_color to #FF0000 in each file

2. Test sequence:

   • Launch Kitty terminal
   • Create a split
   • Split borders using default color (incorrect)
   • Switch system theme (light/dark)
   • Observe split borders now using inactive_border_color

Screenshots

At startup:

After switching system theme from light -> dark -> light:

Environment details

kitty 0.38.0 (d3f93cb0cb) created by Kovid Goyal
Darwin JachH-MacBook-Air-13.local 24.2.0 Darwin Kernel Version 24.2.0: Fri Dec  6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112 arm64
ProductName:  macOS ProductVersion:  15.2 BuildVersion:  24C101
OpenGL: '4.1 Metal - 89.3' Detected version: 4.1
Frozen: True
Fonts:
  medium: IBMPlexMono-Regular: /Users/jj/Library/Fonts/IBMPlexMono-Regular.ttf
          Features: ()
    bold: IBMPlexMono-SemiBold: /Users/jj/Library/Fonts/IBMPlexMono-SemiBold.ttf
          Features: ()
  italic: IBMPlexMono-Italic: /Users/jj/Library/Fonts/IBMPlexMono-Italic.ttf
          Features: ()
      bi: IBMPlexMono-SemiBoldItalic: /Users/jj/Library/Fonts/IBMPlexMono-SemiBoldItalic.ttf
          Features: ()
Paths:
  kitty: /Applications/kitty.app/Contents/MacOS/kitty
  base dir: /Applications/kitty.app/Contents/Resources/kitty
  extensions dir: /Applications/kitty.app/Contents/Resources/Python/lib/kitty-extensions
  system shell: /bin/zsh
System color scheme: light. Applied color theme type: light
Loaded config files:
  /Users/jj/.config/kitty/kitty.conf

Config options different from defaults:
active_border_color     None
allow_remote_control    yes
background_blur         32
confirm_os_window_close 0
copy_on_select          clipboard
cursor_trail            1
cursor_trail_decay      (0.05, 0.1)
enabled_layouts         ['splits', 'tall', 'stack', 'fat:bias=50;full_size=1;mirrored=false']
font_family             IBM Plex Mono
font_size               14.0
hide_window_decorations 2
inactive_text_alpha     0.8
input_delay             0
listen_on               unix:/tmp/mykitty
macos_option_as_alt     3
mouse_hide_wait         -1.0
repaint_delay           2
shell                   /usr/local/bin/fish
sync_to_monitor         False
tab_bar_align           center
tab_bar_edge            1
tab_bar_margin_height   TabBarMarginHeight(outer=8.0, inner=0)
tab_bar_style           separator
tab_separator            
tab_title_template      ⏺
wayland_enable_ime      False
window_padding_width    FloatEdges(left=10.0, top=2.0, right=10.0, bottom=2.0)
Changed mouse actions:
 right press ungrabbed →  mouse_select_command_output # right click to select command output
Changed shortcuts:
 cmd+k →  clear_terminal_and_scrollback
 ctrl+cmd+, →  reload_config
 opt+cmd+r →  reset_terminal
 shift+cmd+/ →  open_kitty_website
Colors:
 active_tab_background   #ffffff
 active_tab_foreground   #4170ae
 background              #ffffff
 color1                  #c82828
 color10                 #708b00
 color11                 #e9b600
 color12                 #4170ae
 color13                 #8958a7
 color14                 #3d999f
 color15                 #fffefe
 color2                  #708b00
 color3                  #e9b600
 color4                  #4170ae
 color5                  #8958a7
 color6                  #3d999f
 color7                  #fffefe
 color8                  #000000
 color9                  #c82828
 cursor                  #4c4c4c
 foreground              #4c4c4c
 inactive_border_color   #ff0000
 inactive_tab_background #ffffff
 inactive_tab_foreground #d6d6d6
 selection_background    #d6d6d6
 selection_foreground    #ffffff

Important environment variables seen by the kitty process:
 PATH                                /Applications/kitty.app/Contents/MacOS:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
 LANG                                en_US.UTF-8
 SHELL                               /bin/zsh
 USER                                jj

Additional context

The issue persist with no config.