One example is Marketplace Client providing support for eclipse+mpc://... URIs. Using the BrowserViewer and clicking an eclipse+mpc://... link target will open the Marketplace Client wizard.

Such URLs have the form eclipse+command://commandId?param1Id=value&param2Id=value.
For example, to open a preference page: eclipse+command://org.eclipse.ui.window.preferences?preferencePageId=org.eclipse.ui.browser.preferencePage

This link handler must be activated from the Link handlers preference page to bind the Eclipse application with this URL scheme in the OS.

These APIs have already been commonly used by dependency injection in E4 RCP applications, but have only been marked as provisional APIs thus far. The provisional flag has now been removed.

Example:

int result = SafeRunner.run(new ISafeRunnableWithResult <Integer >() {
     @Override
     public Integer runWithResult() throws Exception {
          return 42;
     }
     })

Using lambda:

int result = SafeRunner.run(() -> 42);

Here's how it looks when enabled with the dark theme:

     # Set the selected tab highlight color 
     swt-selected-tab-highlight: white;
     # Set whether the highlight should be on top or bottom of the tab (default is true)
     swt-selected-highlight-top: false;
    

Screenshot of ligatures drawn in StyledText and Text widgets on Windows 10:

• Dark scrollbars (only on Win10)
• Custom colors for Menu bar:

  For Example: dark menu can be enabled via setting below key/value pairs on the Display instance as shown below: display.setData("org.eclipse.swt.internal.win32.menuBarForegroundColor", new Color(display, 0xD0, 0xD0, 0xD0));
display.setData("org.eclipse.swt.internal.win32.menuBarBackgroundColor", new Color(display, 0x30, 0x30, 0x30));
display.setData("org.eclipse.swt.internal.win32.menuBarBorderColor", new Color(display, 0x50, 0x50, 0x50));
  

• Custom color for Table header lines:

  For Example: table header line color for dark theme can be enabled via setting below key/value pair on the Display instance as shown below: display.setData("org.eclipse.swt.internal.win32.Table.headerLineColor", new Color(display, 0x50, 0x50, 0x50));

• Dark theme compatible Control borders:

  For Example: dark border for below supported controls can be enabled via setting below key/value pair on the Display instance as shown below: display.setData("org.eclipse.swt.internal.win32.Canvas.use_WS_BORDER", true);
display.setData("org.eclipse.swt.internal.win32.List.use_WS_BORDER", true);
display.setData("org.eclipse.swt.internal.win32.Table.use_WS_BORDER", true);
display.setData("org.eclipse.swt.internal.win32.Text.use_WS_BORDER", true);
display.setData("org.eclipse.swt.internal.win32.Tree.use_WS_BORDER", true);
  

  Here's how dark Menu, Table header and Text border looks like in Eclipse:
  
• Custom color for disabled Label foreground color:

  For Example: disabled Label foreground color for dark theme can be enabled via setting below key/value pair on the display instance as shown below: display.setData("org.eclipse.swt.internal.win32.Label.disabledForegroundColor", new Color(display, 0x80, 0x80, 0x80));

  Here's how dark disabled Label looks like in Eclipse:
  

On Windows 10 all the dark theme tweaks including the dark scrollbars 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

Dark scrollbars can be enabled via Display.setData() with the following key/value pair: display.setData("org.eclipse.swt.internal.win32.useDarkModeExplorerTheme", true);

On Windows 10, all the dark theme tweaks including the dark scrollbars 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

When saving, there are some options to control saving:

• save to incrementing file numbers to make it easier to capture multiple files without prompts
• save the preview to png files cross referenced to the main text file
• include stack traces if "Stack" is checked