Allow checking contrast of transparent colors in TM scope viewer.

src/vs/workbench/contrib/codeEditor/browser/inspectTMScopes/inspectTMScopes.ts

@@ -266,10 +266,10 @@ class InspectTMScopesWidget extends Disposable implements IContentWidget {
 		result += `<tr><td class="tm-metadata-key">font style</td><td class="tm-metadata-value">${this._fontStyleToString(metadata.fontStyle)}</td></tr>`;
 		result += `<tr><td class="tm-metadata-key">foreground</td><td class="tm-metadata-value">${Color.Format.CSS.formatHexA(metadata.foreground)}</td></tr>`;
 		result += `<tr><td class="tm-metadata-key">background</td><td class="tm-metadata-value">${Color.Format.CSS.formatHexA(metadata.background)}</td></tr>`;
-		if (metadata.background.isOpaque() && metadata.foreground.isOpaque()) {
-			result += `<tr><td class="tm-metadata-key">contrast ratio</td><td class="tm-metadata-value">${metadata.background.getContrastRatio(metadata.foreground).toFixed(2)}</td></tr>`;
+		if (metadata.background.isOpaque()) {
+			result += `<tr><td class="tm-metadata-key">contrast ratio</td><td class="tm-metadata-value">${metadata.background.getContrastRatio(metadata.foreground.makeOpaque(metadata.background)).toFixed(2)}</td></tr>`;
 		} else {
-			result += '<tr><td class="tm-metadata-key">Contrast ratio cannot be precise for colors that use transparency</td><td class="tm-metadata-value"></td></tr>';
+			result += '<tr><td class="tm-metadata-key">Contrast ratio cannot be precise for background colors that use transparency</td><td class="tm-metadata-value"></td></tr>';
 		}
 		result += `</tbody></table>`;