Remove existing ANSI colours when adding new ones

Avoids color conflicts by removing previous colors when new ones added.
Fixes #70416.

src/vs/workbench/contrib/debug/browser/debugANSIHandling.ts

@@ -72,16 +72,20 @@ export function handleANSIOutput(text: string, linkDetector: LinkDetector): HTML
 							styleNames.push('code-italic');
 						} else if (code === 4) {
 							styleNames.push('code-underline');
-						} else if ((code >= 30 && code <= 37) || (code >= 90 && code <= 97)) {
-							styleNames.push('code-foreground-' + code);
-						} else if (code === 39) {
-							// Remove all foreground colour codes
+						} else if (code === 39 || (code >= 30 && code <= 37) || (code >= 90 && code <= 97)) {
+							// Remove all previous foreground colour codes
 							styleNames = styleNames.filter(style => !style.match(/^code-foreground-\d+$/));
-						} else if ((code >= 40 && code <= 47) || (code >= 100 && code <= 107)) {
-							styleNames.push('code-background-' + code);
-						} else if (code === 49) {
-							// Remove all background colour codes
+
+							if (code !== 39) {
+								styleNames.push('code-foreground-' + code);
+							}
+						} else if (code === 49 || (code >= 40 && code <= 47) || (code >= 100 && code <= 107)) {
+							// Remove all previous background colour codes
 							styleNames = styleNames.filter(style => !style.match(/^code-background-\d+$/));
+
+							if (code !== 49) {
+								styleNames.push('code-background-' + code);
+							}
 						}
 					}