Support standard desktop shortcuts for refining an active text selection:
Shift+Left/Right by character, Ctrl/Option+Shift+Left/Right by word. Only
active while text is selected; otherwise the keys fall through to page
navigation as before.
Root cause: after a selection the reader container (not the book iframe)
holds focus, so Shift+Left/Right keystrokes reach the parent shortcut
handler and matched the page-turn shortcuts, turning the page instead of
refining the selection.
The new onAdjustTextSelection action runs before the navigation actions:
when a selection is active it extends the iframe selection via
Selection.modify() and suppresses the page turn; an iframe-forwarded key
(already extended natively) just suppresses navigation. handleSelectionchange
now refreshes the popup/range for keyboard-driven changes (no pointer drag)
so the selection toolbar follows the refined selection.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
e982af1725