Platform and Equinox API

Platform Changes
DeferredImageDescriptor API The DeferredImageDescriptor API has been added to JFace allowing the creation of ImageDescriptor instances from a URL, where the calculation of the URL is potentially costly (because it might involve searching through multiple directories or bundles/fragments on disk).

The new API can be called using ImageDescriptor.createFromSupplier along with a Supplier<URL> which will calculate on demand the URL when the image is acessed for the first time. This allows images registered at startup in an ImageRegistry to be deferred until the first time the image is shown on screen.

Old way:

URL url = FileLocator.find(bundle, path);
descriptor = ImageDescriptor.createFromURL(url);

New way:

descriptor = ImageDescriptor.createFromURLSupplier(
  () -> FileLocator.find(bundle, path)
);
Use System colors in workbench CSS theme files In workbench theme CSS files, you can now reference the system colors defined by SWT. To do so, use the SWT field name replacing uderscores _ by dashes - and prefixing with hash #.

For example, to reference the system color SWT.COLOR_LIST_SELECTION_BACKGROUND, you can use #COLOR-LIST-SELECTION-BACKGROUND in your .css files.

Additional widget factories Factories for additional SWT widgets have been created: SashFactory, ShellFactory and SectionFactory.

SWT Changes
Support for Chromium browser renderer SWT now supports Chromium as a browser renderer on all platforms using a new SWT.CHROMIUM constant. Please see this FAQ entry for details on using the Chromium style browser.
Colors have new Device free constructors Starting from Eclipse 4.16, SWT no longer required Colors to be disposed, with Eclipse 4.17 new constructors are available which don't require a Device when creating Colors.
Support for dark theme Menu under Windows10 SWT supports dark theme Menu under Windows10 as below:

Old:

New:

On Windows 10, all the dark theme tweaks including the dark menu can be disabled using the org.eclipse.swt.internal.win32.disableCustomThemeTweaks Java property.
For Example: add this VM argument in eclipse.ini or on the command line after -vmargs: 

-Dorg.eclipse.swt.internal.win32.disableCustomThemeTweaks=true
Improved dark theme Combo under Windows SWT supports improved dark theme Combo under Windows10 as below:

Old:

New:

On Windows 10, all the dark theme tweaks including the dark combo can be disabled using the org.eclipse.swt.internal.win32.disableCustomThemeTweaks Java property.
For Example: add this VM argument in eclipse.ini or on the command line after -vmargs: 

-Dorg.eclipse.swt.internal.win32.disableCustomThemeTweaks=true

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