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The cursor was blitted as an inverse-video cell directly onto the
framebuffer, but that inversion was never recorded. RENDERED (the
diff grid) only stored the logical cell, so when scrolling shifted the
raw pixels up (gop::shift_up), the stale inverse block rode along
while the grids said 'blank' — and blank-vs-blank never re-blits.
Result: a cursor-shaped block at the end of every scrolled line,
surviving even 'clear'.
- flush() now mirrors the inverse colours into RENDERED when drawing
the cursor (and restores RENDERED when erasing it), and the diff
loop skips the visible cursor cell (owned by the cursor pass).
Any scroll/clear then sees CELLS != RENDERED at a stale-inverse
position and repaints it.
- memory.rs heap self-test: snapshot heap state before its own
allocations and assert the heap returns to that state, instead of
asserting it coalesces to a single empty block. The vt cell grids
(allocated earlier in boot) made the old 'free_blocks == 1' check
fail; the new check is correct regardless of prior live allocations.
Verified in QEMU: hexdump /dev/mem streams hundreds of lines, ^C,
screendump shows exactly one inverse cell (the live cursor); 'clear'
leaves exactly one (the fresh prompt cursor). heap self-test OK again.
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The editor's gutter '│' (U+2502) appeared as '???' — write_bytes fed
each UTF-8 byte to the state machine, which mapped every byte >= 0x80
to '?', and the Latin-1 font has no box-drawing glyphs anyway.
- vt.write_bytes now decodes UTF-8 sequences; printable non-ASCII
dispatches to the glyph path instead of the byte parser.
- gop: unicode_glyph_bits() procedurally rasterises box-drawing
(U+2500-257F light/heavy/double), arrows (U+2190-2193) and the em
dash (U+2014) — pure geometry, no font data needed; blit_glyph falls
back to it for ch >= 256.
Verified via framebuffer dumps: editor gutter │ renders as a vertical
line, help screen ═ separators and ←→↑↓ all render as lines (no '?').
Shell banner em dash renders too.
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Kernel now has the classic UNIX console split, so full-screen ANSI apps
can run in ring 0:
- vt.rs: terminal emulator owning the text screen — cell grid (char +
fg/bg), logical cursor (inverse-video), scrolling, and a small ANSI
CSI parser (cursor position H/f, erase J/K, moves A-D, SGR 16-colour
with correct ANSI→VGA mapping, cursor show/hide ?25). Blits only
changed cells; scroll shifts cell grids + pixels and re-rasterises
only the exposed bottom row. gop_println!/clear_screen now render
through the vt; gop.rs is the raw rasteriser (colored glyph blits,
pixel shift).
- tty.rs: line discipline — canonical read_line (echo, line buffer,
^C cancel, ^D EOF) moved out of the shell, and raw read_byte that
translates KeyEvents to the terminal byte protocol (arrows → ESC[A-D,
Backspace → 0x7f, ^X → 0x18, Ctrl+arrows → ESC[1;5A-D, Home/End/PgUp/
PgDn/Delete). interrupt_pressed() stays for streaming commands.
- ps2: generic Ctrl(char) + CtrlArrow events (was: only CtrlC/CtrlD).
- rsdosedit: no_std port of the RNG rsedit editor as the first real
app — undo, syntax highlighting (verified green/gray/yellow on the
framebuffer), search, word nav, smart indent, ^S save / ^X exit /
^X again to discard. termios → tty raw, stdout → vt, std::fs → VFS
(ramfs), SIGWINCH → fixed geometry, force-exit window → key counter.
- shell: 'edit <path>' command; read_line/strbuf moved to rsnix.
- CONTEXT.md: layout + milestones + known-issue perf notes.
Verified in QEMU: full edit → type → arrow-move → insert → save → exit
round trip with byte-exact file content; ANSI colors via screendump.
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