exclude languages from language picker normal section if they are a detected language

src/vs/workbench/browser/parts/editor/editorStatus.ts

@@ -1158,11 +1158,6 @@ export class ChangeModeAction extends Action {
 		const textModel = activeTextEditorControl.getModel();
 		const resource = EditorResourceAccessor.getOriginalUri(this.editorService.activeEditor, { supportSideBySide: SideBySideEditor.PRIMARY });
 
-		let hasLanguageSupport = !!resource;
-		if (resource?.scheme === Schemas.untitled && !this.textFileService.untitled.get(resource)?.hasAssociatedFilePath) {
-			hasLanguageSupport = false; // no configuration for untitled resources (e.g. "Untitled-1")
-		}
-
 		// Compute mode
 		let currentLanguageId: string | undefined;
 		let currentModeId: string | undefined;
@@ -1171,9 +1166,22 @@ export class ChangeModeAction extends Action {
 			currentLanguageId = withNullAsUndefined(this.modeService.getLanguageName(currentModeId));
 		}
 
+		let hasLanguageSupport = !!resource;
+		let detectedLanguages: string[] = [];
+		if (resource?.scheme === Schemas.untitled && !this.textFileService.untitled.get(resource)?.hasAssociatedFilePath) {
+			hasLanguageSupport = false; // no configuration for untitled resources (e.g. "Untitled-1")
+
+			// Detect languages since we are in an untitled file
+			detectedLanguages = await this.languageDetectionService.detectLanguages(resource);
+		}
+
 		// All languages are valid picks
 		const languages = this.modeService.getRegisteredLanguageNames();
-		const picks: QuickPickInput[] = languages.sort().map(lang => {
+		const picks: QuickPickInput[] = languages.sort()
+			.filter(lang => {
+				const modeId = this.modeService.getModeIdForLanguageName(lang.toLowerCase()) || 'unknown';
+				return (detectedLanguages.indexOf(modeId) === -1);
+			}).map(lang => {
 				const modeId = this.modeService.getModeIdForLanguageName(lang.toLowerCase()) || 'unknown';
 				const extensions = this.modeService.getExtensions(lang).join(' ');
 				let description: string;
@@ -1218,10 +1226,8 @@ export class ChangeModeAction extends Action {
 
 		if (hasLanguageSupport) {
 			picks.unshift(autoDetectMode);
-		} else if (resource) {
-			// Handle language detection
-			const detectedLanguages = await this.languageDetectionService.detectLanguages(resource);
-			if (detectedLanguages) {
+		} else if (detectedLanguages) {
+			// Add untitled detected languages
 			for (const modeId of detectedLanguages.reverse()) {
 				const lang = this.modeService.getLanguageName(modeId) || 'unknown';
 				let description: string;
@@ -1240,7 +1246,6 @@ export class ChangeModeAction extends Action {
 
 			picks.unshift({ type: 'separator', label: localize('detectedLanguagesPicks', "detected languages (identifier)") });
 		}
-		}
 
 		const pick = await this.quickInputService.pick(picks, { placeHolder: localize('pickLanguage', "Select Language Mode"), matchOnDescription: true });
 		if (!pick) {