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gsxdsm e347062e1f FN-7603: force xterm DOM-based char measurement to fix mobile terminal spacing

Fixes recurrence #5 of mobile terminal inter-character spacing by unifying xterm's cell-width measurement pipeline with WidthCache's DOM-based glyph measurement, validated against real xterm instead of the jsdom mock.

- Add withDomBasedTerminalCharacterMeasurement() in terminalPreferences.ts: transiently hides window.OffscreenCanvas during terminal.open() so CharSizeService's constructor throws and self-selects its own DOM-based fallback strategy, unifying dimensions.css.cell.width with WidthCache.get('W') measurement
- Wire withDomBasedTerminalCharacterMeasurement() around terminal.open() calls in SessionTerminal.tsx and TerminalModal.tsx
- Add FNXC:Terminal comments documenting the Canvas-vs-DOM measurement divergence root cause, grounded in the installed @xterm/xterm@5.5.0 source
- Add docs/solutions/ui-bugs/xterm-options-noop-remeasure-after-font-settle.md recurrence #5 section
- Expand TerminalModal.test.tsx coverage for the new measurement-forcing behavior
- Add changeset fn-7603-mobile-terminal-spacing.md (patch, fix)

Files changed:
 .changeset/fn-7603-mobile-terminal-spacing.md      |   7 +
 docs/solutions/ui-bugs/xterm-options-noop-remeasure-after-font-settle.md | 101 ++++++
 packages/dashboard/app/components/SessionTerminal.tsx   |  16 +-
 packages/dashboard/app/components/TerminalModal.tsx     |  16 +-
 packages/dashboard/app/components/__tests__/TerminalModal.test.tsx    | 363 ++++++++++++++++++++-
 packages/dashboard/app/utils/terminalPreferences.ts     |  63 ++++
 6 files changed, 554 insertions(+), 12 deletions(-)

Fusion-Task-Id: FN-7603
Fusion-Task-Lineage: 6c7d980f-953e-4fa9-908e-b24125904cbe
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-05 19:42:16 -07:00

architecture-patterns

Merge pull request #1682 from Runfusion/feature/acp-route-a-followups

2026-06-17 06:12:06 +08:00

best-practices

Update docs/solutions/best-practices/merge-conflict-extraction-vs-semantics-and-parallel-bootstrap.md

2026-06-03 15:26:49 -07:00

build-errors

docs(solutions): capture eslint exhaustive-deps CI-lint gotcha

2026-06-21 03:10:21 -07:00

database-issues

docs(workspace): capture Task-field persistence gotcha learning