Polishing.

Introduce method to obtain a position function from OffsetScrollPosition. Tweak documentation wording.

See spring-projects#3070
Original pull request: spring-projects#3072

src/main/antora/modules/ROOT/pages/repositories/scrolling.adoc

@@ -6,7 +6,7 @@ Scrolling consists of a stable sort, a scroll type (Offset- or Keyset-based scro
 You can define simple sorting expressions by using property names and define static result limiting using the xref:repositories/query-methods-details.adoc#repositories.limit-query-result[`Top` or `First` keyword] through query derivation.
 You can concatenate expressions to collect multiple criteria into one expression.
 
-Scroll queries return a `Window<T>` that allows obtaining the elements scroll position which can be used to fetch the next `Window<T>` until your application has consumed the entire query result.
+Scroll queries return a `Window<T>` that allows obtaining the element's scroll position to fetch the next `Window<T>` until your application has consumed the entire query result.
 Similar to consuming a Java `Iterator<List<…>>` by obtaining the next batch of results, query result scrolling lets you access the a `ScrollPosition`  through `Window.positionAt(...)`.
 
 [source,java]
@@ -26,8 +26,8 @@ do {
 [NOTE]
 ====
 The `ScrollPosition` identifies the exact position of an element with the entire query result.
-Query execution treats the position parameter as _exclusive_, which means results will start _after_ the given position.
-`ScrollPosition#offset` and `ScrollPosition#keyset()` as special incarnations of a `ScrollPosition` indicating the start of a scroll operation.
+Query execution treats the position parameter _exclusive_, results will start _after_ the given position.
+`ScrollPosition#offset()` and `ScrollPosition#keyset()` as special incarnations of a `ScrollPosition` indicating the start of a scroll operation.
 ====
 
 `WindowIterator` provides a utility to simplify scrolling across ``Window``s by removing the need to check for the presence of a next `Window` and applying the `ScrollPosition`.
@@ -69,8 +69,8 @@ WindowIterator<User> users = WindowIterator.of(position -> repository.findFirst1
 [CAUTION]
 ====
 There is a difference between `ScollPosition.offset()` and `ScollPosition.offset(0L)`.
-The former indicates the start of scroll operation, pointing to no specific offset where as the latter identifies the first element (at position `0`) of the result.
-Given the _exclusive_ nature of scrolling using `ScollPosition.offset(0)` will skip the first element and translate to an offset of 1.
+The former indicates the start of scroll operation, pointing to no specific offset whereas the latter identifies the first element (at position `0`) of the result.
+Given the _exclusive_ nature of scrolling, using `ScollPosition.offset(0)` skips the first element and translate to an offset of `1`.
 ====
 
 [[repositories.scrolling.keyset]]

src/main/java/org/springframework/data/domain/OffsetScrollPosition.java

@@ -24,7 +24,8 @@
 /**
  * A {@link ScrollPosition} based on the offsets within query results.
  * <p>
- * An initial {@link OffsetScrollPosition} does not point to a specific element and is different to a the Po
+ * An initial {@link OffsetScrollPosition} does not point to a specific element and is different to a position
+ * {{@link ScrollPosition#offset(long)}.
  *
  * @author Mark Paluch
  * @author Oliver Drotbohm
@@ -69,7 +70,7 @@ static OffsetScrollPosition of(long offset) {
 	}
 
 	/**
-	 * Returns the {@link IntFunction position function} to calculate.
+	 * Returns a {@link IntFunction position function} starting at {@code startOffset}.
 	 *
 	 * @param startOffset the start offset to be used. Must not be negative.
 	 * @return the offset-based position function.
@@ -81,6 +82,16 @@ public static IntFunction<OffsetScrollPosition> positionFunction(long startOffse
 		return startOffset == 0 ? OffsetPositionFunction.ZERO : new OffsetPositionFunction(startOffset);
 	}
 
+	/**
+	 * Returns the {@link IntFunction position function} starting after the current {@code offset}.
+	 *
+	 * @return the offset-based position function.
+	 * @since 3.3
+	 */
+	public IntFunction<OffsetScrollPosition> positionFunction() {
+		return positionFunction(isInitial() ? 0 : getOffset() + 1);
+	}
+
 	/**
 	 * The zero or positive offset.
 	 * <p>