Clamp value to 0.2-1

Author: Tyriar

src/vs/workbench/contrib/accessibility/browser/accessibilityContribution.ts

@@ -71,8 +71,10 @@ const configuration: IConfigurationNode = {
 			...baseProperty
 		},
 		[AccessibilitySettingId.UnfocusedViewOpacity]: {
-			description: localize('unfocusedViewOpacity', 'The opacity percentage (0.0 to 1.0) to use for unfocused editors and terminals.'),
+			description: localize('unfocusedViewOpacity', 'The opacity percentage (0.2 to 1.0) to use for unfocused editors and terminals.'),
 			type: 'number',
+			minimum: 0.2,
+			maximum: 1,
 			default: 1,
 			tags: ['accessibility']
 		}

src/vs/workbench/contrib/accessibility/browser/unfocusedViewDimmingContribution.ts

@@ -5,6 +5,7 @@
 
 import { Event } from 'vs/base/common/event';
 import { Disposable, toDisposable } from 'vs/base/common/lifecycle';
+import { clamp } from 'vs/base/common/numbers';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { IWorkbenchContribution } from 'vs/workbench/common/contributions';
 import { AccessibilitySettingId } from 'vs/workbench/contrib/accessibility/browser/accessibilityContribution';
@@ -25,9 +26,12 @@ export class UnfocusedViewDimmingContribution extends Disposable implements IWor
 				return;
 			}
 
-			let opacity = configurationService.getValue(AccessibilitySettingId.UnfocusedViewOpacity);
-			if (typeof opacity !== 'number') {
+			let opacity: number;
+			const opacityConfig = configurationService.getValue(AccessibilitySettingId.UnfocusedViewOpacity);
+			if (typeof opacityConfig !== 'number') {
 				opacity = 1;
+			} else {
+				opacity = clamp(opacityConfig, 0.2, 1);
 			}
 
 			const rules = new Set<string>();