Update N&N: Clarify rationale for Cursor constructor deprecation in SWT

- Updated the news and noteworthy entry for the deprecation of
`Cursor(Device, ImageData, ImageData, int, int)` in SWT.
- Clarified that the constructor was deprecated due to limited DPI
support.
- Explained that the new `Cursor(Device, ImageDataProvider, int, int)`
constructor provides the best image for all zoom levels, ensuring proper
support for high-DPI displays.

Author: ShahzaibIbrahim

news/4.38/platform_isv.md

@@ -7,7 +7,28 @@ A special thanks to everyone who [contributed to Eclipse-Platform](acknowledgeme
 ## Platform Changes
 -->
 
-<!--
----
+
 ## SWT Changes
--->
+
+### Cursor Constructor Deprecation and Replacement
+
+<details>
+<summary>Contributors</summary>
+
+- [Shahzaib Ibrahim](https://github.com/ShahzaibIbrahim)
+</details>
+
+The constructor `Cursor(Device, ImageData, ImageData, int, int)` has been **deprecated** in SWT due to its limited DPI support.
+
+This constructor requires separate source and mask image data. However, this approach has become uncommon, as modern practices typically encode mask data directly into the image data itself (for example, by using alpha channels). For this reason, the constructor that accepts a single `ImageData` object (containing both the image and mask information) is **not** deprecated and remains the recommended approach.
+
+You should now use the new constructor:
+
+```
+Cursor(Device, ImageDataProvider, int, int)
+```
+
+The new `ImageDataProvider`-based constructor ensures you get the best image for the cursor at all zoom levels, providing proper support for high-DPI displays and modern environments.
+
+**Action Required:**  
+Please update your code to use the new constructor for better compatibility and future-proofing.