fix: trigger select-all via CDP commands field

[myabc]

Problem

Ctrl/Cmd+A does not select text when driven through Ferrum::Node#type / Ferrum::Keyboard. Selecting-then-replacing content in an <input> or a contenteditable is impossible, so callers resort to workarounds. Ferrum's own specs sidestep it — the delete_all helper in spec/node_spec.rb selects via Shift+modifier+Right caret movement rather than Ctrl+A, which only works for single-word content.

Root cause

Synthetic key events dispatched via Input.dispatchKeyEvent do not trigger the browser's editing accelerators. This holds regardless of text presence or keyDown/rawKeyDown type — verified by probing a live browser: no key-event variant of Ctrl/Cmd+A produces a selection.

The reliable mechanism is the CDP commands field on the key event: passing commands: ["selectAll"] makes Chrome run the editing command. This is how Playwright and Puppeteer implement editing shortcuts.

Fix

When a chord matches the platform select-all accelerator (Cmd on macOS, Ctrl elsewhere), name the editing command via commands. Existing text/modifiers handling is untouched — only an extra field is added for the matching chord, so normal typing and all existing modifier behaviour are unaffected.

The editing_command helper is scoped to select-all for now (the common need) and excludes Shift, but is written to extend to further commands.

Testing

New #type specs in spec/node_spec.rb cover a contenteditable (#filled_div) and an <input> (#filled_input): type([mod, "a"], :backspace) clears the field. The full #type context stays green (44 examples).

Real-world beneficiaries

• capybara_accessible_selectors — clearing a rich-text contenteditable currently needs a driver-specific backspace loop.
• OpenProject's Capybara helpers — clear_input_field_contents does a manual right+backspace dance on inputs (commented "Ferrum is yet support fill_options…"); collapses to node.type([:control, "a"], :backspace) once the accelerator works.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR ensures Ferrum::Node#type triggers the browser’s native “select all” shortcut (Ctrl/Cmd+A) by emitting the appropriate CDP commands field, enabling reliable select-and-replace behavior in inputs and contenteditables.

Changes:

• Add keyboard normalization logic to map the platform accelerator + A chord to the CDP selectAll editing command.
• Add specs covering select-all then clear for both an <input> and a contenteditable <div>.
• Document the fix in the changelog.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
spec/node_spec.rb	Adds regression tests verifying select-all then backspace clears input/contenteditable.
lib/ferrum/keyboard.rb	Adds mapping from accelerator+A to CDP commands: ["selectAll"] during key normalization.
CHANGELOG.md	Documents the select-all shortcut fix for Node#type / Keyboard.

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