RFR: 8091429: ObservableList<E>#replaceRange(int from, int to, Collection<? extends E> col) [v3]

[Michael Strauß]

On Wed, 5 Nov 2025 16:19:36 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> This PR implements a new default method on `ObservableList` to be able to replace elements within a specified range.
>> 
>> Justification for this change is to allow an `ObservableList` to be bulk modified resulting in a single `ListChangeListener` call back.  In this way the callbacks don't observe the list changing its size from S to S-X back to S again(*). Currently the only way to bulk replace a range of items is to remove X items then add X items, resulting in two listener callbacks in between which the size of the list can be observed to change.
>> 
>> The other alternative is to call `set` individually for each item, which results in many change notifications.
>> 
>> With the addition of this PR, and the changes in `ModifiableObservableListBase`, replacing a range of items becomes a single change callback.
>> 
>> (*) The list may indeed change size still as plain `List` does not have `setAll` operations; size listeners may observe this, but it will no longer be observable from a `ListChangeListener` due to multiple separate callbacks.
>
> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add additional tests

modules/javafx.base/src/main/java/javafx/collections/ObservableList.java line 105:

> 103:      *         or {@code from > to}
> 104:      */
> 105:     public default boolean replaceRange(int from, int to, Collection<? extends E> col) {

This method needs an `@since 26` tag.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1937#discussion_r2496532720