When a category variable is set explicitly in both universal and session
scope, interactive fish prints a one-line stderr warning ("successfully set
universal 'X'; but a global by that name shadows it") on each `set -U`/`set
-g`. That stray line landed between the apply and the in-place panel redraw,
pushing the cursor down one row so the `\e[14A` cursor-up no longer reached
the top border — leaving it behind to stack on every toggle and persist
after exit.
Suppress stderr on the six set commands in __config_toggle_apply. The
warning is expected noise here since config-toggle edits both scopes
independently. The warning only fires in a real interactive TTY (not under
`fish -ic`), which is why it was easy to miss when testing.
Directional arrows fully cover value changes, so the Space cycle is
removed. Add h/l as vim-style aliases for ←/→ (matching the existing
j/k for up/down), keeping the whole keymap hjkl-consistent. Update the
in-panel hint, help text, docstrings, and offline docs accordingly.
Left/Right now adjust the highlighted value one step along the
OFF ← DEFAULT → ON scale, clamped at the ends (no wrap), complementing
Space which cycles through all states and wraps. Right steps toward ON,
Left toward OFF.
Extract the set/erase side-effect into __config_toggle_apply so Space,
Left, and Right share one implementation of the scope-aware
set -U/-g/-Ue/-eg logic. Update the in-panel keybind hint (now
width-padded via string pad so the border stays aligned) and the help
text and offline docs to cover the new keys.