text files - don't auto adjust encoding if mode explicitly set

Author: bpasero

src/vs/workbench/common/editor/textEditorModel.ts

@@ -118,6 +118,7 @@ export class BaseTextEditorModel extends EditorModel implements ITextEditorModel
 		const lang = await this.languageDetectionService.detectLanguage(this.textEditorModelHandle);
 		if (lang && !this.isDisposed()) {
 			this.setLanguageIdInternal(lang);
+
 			const languageName = this.languageService.getLanguageName(lang);
 			if (languageName) {
 				this.accessibilityService.alert(localize('languageAutoDetected', "Language {0} was automatically detected and set as the language mode.", languageName));

src/vs/workbench/services/textfile/common/textFileEditorModel.ts

@@ -1004,6 +1004,10 @@ export class TextFileEditorModel extends BaseTextEditorModel implements ITextFil
 		//
 		// (see https://github.com/microsoft/vscode/issues/127936)
 
+		if (this.hasLanguageSetExplicitly) {
+			return; // return early when the language was changed by the user
+		}
+
 		if (!this.configurationService.inspect('files.encoding').overrideIdentifiers?.includes(e.newLanguage)) {
 			return; // only when there is a language specific override for the new language
 		}