Mobile: quick quote captures only one word or selection expands to end of page

[avandenberghe]

Description

Two related mobile issues with quick quote:

1. On mobile Firefox/Android, double-tap to select a word then expand the selection — the quote popup only captures the initially selected word, not the expanded selection.
2. On Android Chrome, attempting to expand a selection causes it to jump to the end of the page.

Root cause

In quickreply_plugins.js (line ~291), the initialization binds both touchstart and mousedown handlers:

if ('ontouchstart' in window) {
    quickreply.$.qrPosts.on('touchstart', '.content', handleQuickQuote);
}
quickreply.$.qrPosts.on('mousedown', '.content', handleQuickQuote)
    .on('mouseup', '.content', addQuickQuote);

Single-word capture: The touchstart handler fires immediately when the user starts touching, before the selection is expanded. The selectionchange listener teardown is bound to mouseup (line ~271), but mouseup may fire prematurely on mobile (when the user lifts their finger after the initial long-press), removing the listener before the user finishes adjusting selection handles.

Selection expanding to end of page: On mobile devices that emit both touch and mouse events, handleQuickQuote fires twice (once for touchstart, once for synthetic mousedown), creating duplicate selectionchange listeners. Additionally, calling range.getClientRects() during an active mobile selection operation can interfere with the browser's native selection behavior.

Suggested fix

• Use only touch events on touch devices (skip mousedown/mouseup binding when ontouchstart is available)
• Debounce selectionchange handling
• Clean up selectionchange listener on touchend instead of mouseup

References

• Originally reported as Quoting after double tap on mobile BoardTools/QuickReply#98, Selecting more text (mobile andorid chrome) BoardTools/QuickReply#99

[avandenberghe]

Cannot reproduce — no Android device available for testing. Leaving open for future verification. If anyone can test on Android Chrome/Firefox, please report.