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batch terminal output at 60fps, increase read buffer to 64KB
test / unit + widget + golden + a11y (push) Failing after 29s
test / integration_test (xvfb) (push) Has been skipped
test / bundle smoke (xvfb 5s) (push) Has been skipped
test / daemon subprocess + web WASM smoke (push) Has been skipped

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Split escape sequences caused rendering artifacts (visible % prompt
mark, garbled lines between commands). Two fixes from the legacy
Python implementation:

1. Read buffer increased from 4096 to 65536 bytes. Larger reads mean
   fewer chunk boundaries that can split multi-byte escape sequences.

2. Output writes throttled to ~60fps via a 16ms Timer. Multiple PTY
   reads within one frame window are batched into a single
   terminal.write() call, so the xterm parser sees complete sequences
   instead of fragments that render as garbage between frames.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jeroen Schweitzer
2026-05-01 12:01:22 +02:00
co-authored by Claude Opus 4.6
parent 0485a36091
commit 3e6c0279ef
3 changed files with 24 additions and 15 deletions
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lib/src/pty/native_pty.dart
+2 -2
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@@ -236,7 +236,7 @@ class NativePty {
ffi.Int32 Function(ffi.Pointer<_Pollfd>, ffi.Uint32, ffi.Int32),
int Function(ffi.Pointer<_Pollfd>, int, int)>('poll');
final buf = malloc<ffi.Uint8>(4096);
final buf = malloc<ffi.Uint8>(65536);
final pfd = calloc<_Pollfd>();
pfd.ref.fd = fd;
pfd.ref.events = 0x0001; // POLLIN
@@ -249,7 +249,7 @@ class NativePty {
if (pfd.ref.revents & 0x0038 != 0 && pfd.ref.revents & 0x0001 == 0) {
break;
}
final n = rd(fd, buf.cast(), 4096);
final n = rd(fd, buf.cast(), 65536);
if (n <= 0) break;
port.send(Uint8List.fromList(buf.asTypedList(n)));
}