fix(picker-column): commit value on outside press

[ShaneK]

Issue number: resolves #30449

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What is the current behavior?

ion-picker-column commits the centered option on a 250ms idle timer that only starts once the wheel stops moving. Flick a wheel and tap a Save button while it's still coasting, and the click handler reads the previous value. On an ion-datetime with preferWheel, the wheel shows one date while value still reports another.

What is the new behavior?

During a scroll the user started, the column watches for pointerdown anywhere outside itself. On that press it halts the wheel on the option under the highlight and commits it synchronously, so an application's own click handler reads the value the user can see. A press on a sibling wheel in the same picker is exempt, so reaching for the next column leaves the first one coasting. The datetime wheel handlers now read the working and active parts at event time, because an outside press settles every coasting column in one synchronous dispatch and the previous render-time reads clobbered each other.

Does this introduce a breaking change?

• Yes
• No

Other information

The community PR for this issue, #30674, was a great attempt, but it takes the reporter's other suggestion and adds public ionScrollStart and ionScrollEnd events to ion-picker-column and ion-datetime. I didn't go that way for two reasons. It's permanent public API on two components plus the Angular and Vue proxies, carried by every consumer forever, to work around a bug. More importantly it doesn't fix the stale value: every app has to write the disable-Save logic itself, and its ionScrollEnd is debounced 300ms after the wheel settles, so a tap during the flick still reads the old value at the moment the click handler runs. Committing on pointerdown fixes existing apps with no code change. The scroll events are a fair feature request on their own, just a separate one from this bug fix.

Preview:

• Picker column scroll: iOS / MD
• Datetime prefer-wheel: iOS / MD

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Project	Deployment	Actions	Updated (UTC)
ionic-framework	Ready	Preview	Aug 21, 2026 3:41pm

[thetaPC]

LGTM