Add warning in preferences dialog

Add a warning about flickering effects caused by the Edge browser under
Preferences > General > Appearance.

bundles/org.eclipse.ui.workbench/eclipseui/org/eclipse/ui/internal/WorkbenchMessages.java

@@ -76,6 +76,8 @@ public class WorkbenchMessages extends NLS {
 
 	public static String StatusUtil_errorOccurred;
 
+	public static String EdgeBrowserDisclaimer;
+
 	// ==============================================================================
 	// Workbench Actions
 	// ==============================================================================

bundles/org.eclipse.ui.workbench/eclipseui/org/eclipse/ui/internal/dialogs/ViewsPreferencePage.java

@@ -214,7 +214,8 @@ private void createHiDPISettingsGroup(Composite parent) {
 		GridLayout layout = new GridLayout(1, false);
 		group.setLayout(layout);
 		Label infoLabel = new Label(group, SWT.WRAP);
-		infoLabel.setText(WorkbenchMessages.RescaleAtRuntimeDisclaimer);
+		infoLabel.setText(WorkbenchMessages.RescaleAtRuntimeDisclaimer + System.lineSeparator() + System.lineSeparator()
+				+ WorkbenchMessages.EdgeBrowserDisclaimer);
 		infoLabel.setLayoutData(GridDataFactory.defaultsFor(infoLabel).create());
 		createLabel(group, ""); //$NON-NLS-1$
 

bundles/org.eclipse.ui.workbench/eclipseui/org/eclipse/ui/internal/messages.properties

@@ -505,6 +505,7 @@ RescaleAtRuntimeSettingChangeWarningText = Restart for the DPI setting changes t
 HiDpiSettingsGroupTitle = HiDPI settings
 RescaleAtRuntimeEnabled = Monitor-specific UI &scaling
 RescaleAtRuntimeDisclaimer = EXPERIMENTAL! Activating this option will dynamically scale all windows according to the monitor they are currently in. It will also set the default browser to Edge in order to provide the appropriate scaling of content displayed in a browser. This feature is still in development and therefore considered experimental.
+EdgeBrowserDisclaimer = WARNING! Changing the size of the browser window can currently cause flickering effects, which are currently being resolved. People who are sensitive to this should therefore either not use Edge at the moment or possibly avoid resizing browser windows. 
 # --- Workbench -----
 WorkbenchPreference_openMode=Open mode
 WorkbenchPreference_doubleClick=D&ouble click