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Broken rendering and UnboundLocalError #2896

@akobel

Description

@akobel

Describe the bug
Since kitty 0.18.2, roughly 90% of the time kitty complains about UnboundLocalError: local variable 'boss' referenced before assignment and renders ugly characters until I resize or change the window geometry. It's specific to my low-dpi screen, though; see "environment" below.

To Reproduce
Just kitty.

Expected behavior
Just kitty as I know her... ;-)

Screenshots
Left terminal: fine rendering after resizing to half the screen, which changes the window geometry.
Right terminal: borken fonts.
20200803_18h34m02s_grim

Environment details
Arch Linux, all up-to-date, with kitty 0.18.2 from the repos. Same with kitty straight from git.
Sway on Wayland, on a dual-screen setup; high-dpi screen with scale=2 is perfectly good, the classic low-dpi monitor with scale=1 is the troublemaker.

kitty 0.18.2 created by Kovid Goyal
Linux x1c 5.7.11-zen1-1-zen #1 ZEN SMP PREEMPT Wed, 29 Jul 2020 21:39:59 +0000 x86_64
Arch Linux \r (\l)
Loaded config files: /home/akobel/.config/kitty/kitty.conf
Running under: Wayland

Config options different from defaults:
active_border_color     Color(red=146, green=128, blue=128)
active_tab_background   Color(red=36, green=24, blue=40)
active_tab_foreground   Color(red=19, green=153, blue=19)
allow_remote_control    y
background              Color(red=0, green=21, blue=20)
bell_border_color       Color(red=186, green=138, blue=0)
close_on_child_death    True
color0                  Color(red=0, green=21, blue=20)
color1                  Color(red=250, green=51, blue=51)
color10                 Color(red=58, green=167, blue=58)
color11                 Color(red=186, green=138, blue=0)
color12                 Color(red=136, green=135, blue=240)
color13                 Color(red=216, green=92, blue=242)
color14                 Color(red=29, green=161, blue=175)
color15                 Color(red=162, green=159, blue=160)
color2                  Color(red=19, green=153, blue=19)
color3                  Color(red=158, green=129, blue=0)
color4                  Color(red=85, green=127, blue=235)
color5                  Color(red=213, green=76, blue=191)
color6                  Color(red=0, green=149, blue=128)
color7                  Color(red=146, green=128, blue=128)
color8                  Color(red=36, green=24, blue=40)
color9                  Color(red=240, green=104, blue=26)
cursor                  Color(red=162, green=159, blue=160)
cursor_text_color       Color(red=0, green=21, blue=20)
disable_ligatures       2
enable_audio_bell       False
font_family             AK UI Terminal
font_size               10.0
foreground              Color(red=162, green=159, blue=160)
inactive_border_color   Color(red=36, green=24, blue=40)
inactive_tab_background Color(red=0, green=21, blue=20)
inactive_tab_foreground Color(red=146, green=128, blue=128)
selection_background    Color(red=162, green=159, blue=160)
selection_foreground    Color(red=0, green=21, blue=20)
url_color               Color(red=85, green=127, blue=235)
visual_bell_duration    0.05
Added shortcuts:
	shift+page_up KeyAction(func='scroll_page_up', args=())
	shift+page_down KeyAction(func='scroll_page_down', args=())

(AK UI Terminal is a fontconfig-alias for Source Code Pro Regular, but the same issue happens with DejaVu Sans Mono or other fonts.)

Additional context
None of the above seems to matter except font_size 10. In fact, this seems to be the minimal kitty.conf to reproduce the problem.

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