Inconsistent background_opacity

[Trial97]

Describe the bug
A clear and concise description of what the bug is.
You can set the background_opacity 0.0 if you try to use a command like map kitty_mod+a>0 set_background_opacity 0.0 it will set it to 0.1

To Reproduce
Steps to reproduce the behavior:

1. Enable and set background_opacity to 0.0
2. Add a command that sets the background opacity:

map kitty_mod+a>0 set_background_opacity 0.0
map kitty_mod+a>d set_background_opacity default

3. Press key combination
4. The terminal background changes( I expect to not or at least to not let me set the opacity to 0 from the first try)

Screenshots
Kitty just opened(with opacity 0):

Kitty after I press the combination of keys:

Environment details

kitty 0.33.1 created by Kovid Goyal
Linux Clockwork 6.6.31-1-MANJARO #1 SMP PREEMPT_DYNAMIC Sat May 18 01:27:42 UTC 2024 x86_64
Manjaro Linux 6.6.31-1-MANJARO  (Clockwork) (/dev/tty)


DISTRIB_ID="ManjaroLinux"
DISTRIB_RELEASE="24.0.0"
DISTRIB_CODENAME="Wynsdey"
DISTRIB_DESCRIPTION="Manjaro Linux"
Running under: X11
Frozen: False
Paths:
  kitty: /usr/bin/kitty
  base dir: /usr/lib/kitty
  extensions dir: /usr/lib/kitty/kitty
  system shell: /usr/bin/zsh
Loaded config files:
  /home/trial/.config/kitty/kitty_bug.conf

Config options different from defaults:
background_opacity         0
dynamic_background_opacity True
Changed shortcuts:
	kitty_mod+a > m →  set_background_opacity default, set_background_opacity 0.0, set_background_opacity 1, set_background_opacity -0.1, set_background_opacity +0.1

Important environment variables seen by the kitty process:
	LANG                                en_US.utf8
	EDITOR                              nvim
	SHELL                               /usr/bin/zsh
	DISPLAY                             :0
	XDG_SEAT                            seat0
	XDG_SESSION_DESKTOP                 awesome
	XDG_SESSION_TYPE                    x11
	XDG_SEAT_PATH                       /org/freedesktop/DisplayManager/Seat0
	XDG_SESSION_CLASS                   user
	XDG_VTNR                            7

Additional context
Basic config used:

dynamic_background_opacity yes
background_opacity 0.0

map kitty_mod+a>d set_background_opacity 0.0
map kitty_mod+a>0 set_background_opacity default

Is there a reason that when dynamically setting the opacity the minimum is set to 0.1?

[Trial97]

Not sure if this is intentional:

kitty/tools/cmd/at/set_background_opacity.go

Lines 12 to 14 in 8498964

	if ans < 0.1 {
	ans = 0.1
	}

here you are still setting the minimum to 0.1 for some opacity stuff

[kovidgoyal]

Yeah thanks, forgot that one.