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Reported by the aegis-fc peer session testing srdwm's own layer-shell
strut handling: a maximized X11 client sat 4-8px past the right and
bottom screen edges whenever its border was nonzero.
set_border_width sets the frame's native X11 border-width attribute,
which the X server draws outside a window's own declared width/height on
all four sides - unlike every other backend's own border in this
compositor (rendered as ordinary pixels inside the allocated geometry
rect). apply_geometry configured the frame at geometry's own x/y/width/
height verbatim, so a nonzero native border pushed the frame's true
visible footprint 2*border_width past every edge of what geometry
actually promised.
Fixed by shifting the configured origin inward and the configured size
down by border_width on both axes (frame_geometry_for, pulled out as a
pure function so it's unit-tested without a real X11 connection) - the
visible footprint, native border included, now lands exactly on
geometry. border_width == 0 reduces to the prior behavior exactly.
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Pure reorganization, no behavior change - verified by diffing the
function-name and struct/trait-name sets before/after (both identical)
plus a full cargo test pass. lib.rs is now a thin shim (mod
declaration + pub use), same pattern crates/config used, since a crate
root can't itself become a directory. platform/mod.rs keeps the atom
table, Frame/X11Platform's struct definitions, the small free-function
helpers (err, modmask_for_keycode_in_mod_slots, rgb_to_pixel), and the
ClonedForRender trait+impl. The rest splits by concern:
- connect.rs: connect, keymap/modifier helpers, grab_keybindings.
- window.rs: manage_new_window and the other per-client lifecycle
methods (window_title/class, supports_wm_delete, unmanage,
frame_for).
- events.rs: handle_event, the X11 event-dispatch loop.
- actions.rs: raise_and_focus/request_close/sync_geometry/
redraw_all_decorations.
- trait_impl.rs: `impl Platform for X11Platform` - named to avoid
clippy's module_inception lint, since the containing directory is
already named `platform`.
- tests.rs: unsplit, same reasoning as every other split this pass.
A handful of X11Platform methods (frame_for, manage_new_window,
unmanage, raise_and_focus, request_close, sync_geometry,
keycode_to_keysym, modifiers_from_state, handle_event) went from
private to pub(super): called across what are now sibling submodules,
which Rust's privacy model doesn't let see each other's private items.
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