src/vs/workbench/browser/parts/editor/sideBySideEditor.ts/SideBySideEditor/clearInput
class SideBySideEditor:	override clearInput(): void {
		if (this.primaryEditorPane) {
			this.primaryEditorPane.clearInput();
		}

		if (this.secondaryEditorPane) {
			this.secondaryEditorPane.clearInput();
		}

		this.disposeEditors();

		super.clearInput();
	}