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The static musl release builds cannot dlopen -- musl compiles it out
-- so loadable shader plugins were a feature most shipped binaries
could not use. Nothing we ship used it either: every shader in
contrib/shaders is an expression. Gone: the dlopen/glob loader in
shader.c, shader_dir in the config, the plugin ABI table and entry
macro, the Windows dl*/glob shims that existed only for it, the
contrib/shader-plugin skeleton, its tests, and every doc mention.
shader_abi.h stays as the shader model (cell_t, shade_ctx_t,
shader_t) with a note about what it used to be.
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The out-of-the-box look, rethought as one piece:
- the compiled-in palette calms down: muted blue #7aa2f7 on the same
neutral darks, with the colours that mean something kept semantic --
amber bell, red-orange dead. sl0p stays one include away as the house
style, and contrib/themes/default.kdl is the starting point written
down (theme-tour shows it).
- derived state defaults now actually follow the theme: the scrolled
wash is rebuilt from scroll_bg after the theme block (it used to bake
the compiled accent), and declaring a state -- in any file of an
include chain -- still wins. The dump writes derived states as
comments so C-a e cannot pin what is meant to keep following.
- a bell you can see: the frame blinks three times in theme's bell
colour then breathes until answered, and a soft diagonal shimmer --
the bell colour halved towards default_fg, width breathing on a sine
-- crosses the body for the same 900ms. bell_indicator false silences
all of it; states { bell { } } replaces it like any state. since
carries the clock dependency, so an idle session pays nothing.
- scrollback says where it continues: while scrolled, the viewport's
top and bottom rows melt towards an edge with content past it and
turn solid at the buffer's end. New expression variables above/below
(lines hidden past each edge, own dependency bit, cached per scroll
position), carried in shade_ctx_t -- SLOSH_SHADER_ABI 3 -> 4.
- expressions survive the dump: a program keeps its source and cb_chain
writes it back, so amount="(y % 2) * 40" no longer dumps as a number.
- headers move to include/, -Iinclude everywhere; the plugin Makefile's
SLOSH var becomes SLOSH_DIR because slosh exports SLOSH=1 into every
pane it runs, and building from inside a session read that as a path.
- comment drift culled where features outran the prose, and the
derivation boilerplate folded into derived_pass()/ctx_scroll().
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