Make TextEditorOptions.fromEditor static (#26779)

Refactors TextEditorOptions.fromEditor to a static method instead of an instance method. This method is only called after creation of the options object and currently requires using a weird cast in a few places

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

@@ -60,8 +60,7 @@ export class SplitEditorAction extends Action {
 		let options: EditorOptions;
 		const codeEditor = getCodeEditor(editorToSplit);
 		if (codeEditor) {
-			options = new TextEditorOptions();
-			(<TextEditorOptions>options).fromEditor(codeEditor);
+			options = TextEditorOptions.fromEditor(codeEditor);
 		} else {
 			options = new EditorOptions();
 		}
@@ -317,9 +316,7 @@ export abstract class BaseFocusSideGroupAction extends Action {
 			let options: EditorOptions;
 			const codeEditor = getCodeEditor(referenceEditor);
 			if (codeEditor) {
-				options = new TextEditorOptions();
-				options.pinned = true;
-				(<TextEditorOptions>options).fromEditor(codeEditor);
+				options = TextEditorOptions.fromEditor(codeEditor, { pinned: true });
 			} else {
 				options = EditorOptions.create({ pinned: true });
 			}

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

@@ -1054,8 +1054,7 @@ export class EditorGroupsControl extends Themable implements IEditorGroupsContro
 			const activeEditor = $this.editorService.getActiveEditor();
 			const editor = getCodeEditor(activeEditor);
 			if (editor && activeEditor.position === stacks.positionOfGroup(identifier.group) && identifier.editor.matches(activeEditor.input)) {
-				options = TextEditorOptions.create({ pinned: true });
-				(<TextEditorOptions>options).fromEditor(editor);
+				options = TextEditorOptions.fromEditor(editor, { pinned: true });
 			}
 
 			return options;

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

@@ -878,8 +878,7 @@ export class EditorPart extends Part implements IEditorPart, IEditorGroupService
 		const activeEditor = this.getActiveEditor();
 		const codeEditor = getCodeEditor(activeEditor);
 		if (codeEditor && activeEditor.position === this.stacks.positionOfGroup(fromGroup) && input.matches(activeEditor.input)) {
-			options = TextEditorOptions.create({ pinned: true, index, inactive, preserveFocus });
-			(<TextEditorOptions>options).fromEditor(codeEditor);
+			options = TextEditorOptions.fromEditor(codeEditor, { pinned: true, index, inactive, preserveFocus });
 		}
 
 		// A move to another group is an open first...

src/vs/workbench/common/editor.ts

@@ -685,24 +685,26 @@ export class TextEditorOptions extends EditorOptions {
 	}
 
 	/**
-	 * Sets the view state to be used when the editor is opening.
+	 * Create a TextEditorOptions inline to be used when the editor is opening.
 	 */
-	public fromEditor(editor: IEditor): void {
+	public static fromEditor(editor: IEditor, settings?: IEditorOptions): TextEditorOptions {
+		const options = TextEditorOptions.create(settings);
 
 		// View state
-		this.editorViewState = editor.saveViewState();
+		options.editorViewState = editor.saveViewState();
 
 		// Selected editor options
 		const codeEditor = <ICommonCodeEditor>editor;
 		if (typeof codeEditor.getConfiguration === 'function') {
 			const config = codeEditor.getConfiguration();
 			if (config && config.viewInfo && config.wrappingInfo) {
-				this.editorOptions = Object.create(null);
-				this.editorOptions.renderWhitespace = config.viewInfo.renderWhitespace;
-				this.editorOptions.renderControlCharacters = config.viewInfo.renderControlCharacters;
-				this.editorOptions.wordWrap = config.wrappingInfo.isViewportWrapping ? 'on' : 'off';
+				options.editorOptions = Object.create(null);
+				options.editorOptions.renderWhitespace = config.viewInfo.renderWhitespace;
+				options.editorOptions.renderControlCharacters = config.viewInfo.renderControlCharacters;
+				options.editorOptions.wordWrap = config.wrappingInfo.isViewportWrapping ? 'on' : 'off';
 			}
 		}
+		return options;
 	}
 
 	/**