fix: follow up to fix for fractionNavigationOrder

src/atoms/genfrac.ts

@@ -7,7 +7,7 @@ import { makeCustomSizedDelim, makeNullDelimiter } from '../core/delimiters';
 import { Context } from '../core/context';
 import { AXIS_HEIGHT } from '../core/font-metrics';
 import type { AtomJson } from 'core/types';
-import { MathfieldElement } from 'public/mathlive';
+import { _MathEnvironment } from 'core/math-environment';
 
 export type GenfracOptions = {
   continuousFraction?: boolean;
@@ -91,7 +91,7 @@ export class GenfracAtom extends Atom {
     if (this._children) return this._children;
 
     const result: Atom[] = [];
-    if (MathfieldElement.fractionNavigationOrder === 'denominator-numerator') {
+    if (_MathEnvironment.fractionNavigationOrder === 'denominator-numerator') {
       for (const x of this.below!) {
         result.push(...x.children);
         result.push(x);

src/core/atom-class.ts

@@ -4,7 +4,7 @@ import { PT_PER_EM, X_HEIGHT } from './font-metrics';
 import { boxType, Box } from './box';
 import { makeLimitsStack, VBox } from './v-box';
 import { joinLatex, latexCommand } from './tokenizer';
-import { Mode, weightString } from './modes-utils';
+import { Mode } from './modes-utils';
 import { getDefinition } from '../latex-commands/definitions-utils';
 
 import { Context } from './context';
@@ -20,7 +20,6 @@ import type {
   Branch,
 } from './types';
 import type { Argument } from 'latex-commands/types';
-import { addBold } from 'editor-model/styling';
 
 /**
  * The order of these branches specify the default keyboard navigation order.

src/core/math-environment.ts

@@ -0,0 +1,8 @@
+/**
+ * Math environment is a collection of settings that are used to configure the math rendering and thay may apply even when there is no mathfield (i.e. in SSR).
+ */
+export const _MathEnvironment: {
+  fractionNavigationOrder: 'denominator-numerator' | 'numerator-denominator';
+} = {
+  fractionNavigationOrder: 'numerator-denominator',
+};

src/editor-mathfield/render.ts

@@ -424,3 +424,9 @@ export function reparse(mathfield: _Mathfield | null): void {
   model.silenceNotifications = wasSilent;
   requestUpdate(mathfield);
 }
+
+export function reparseAllMathfields(): void {
+  for (const mathfield of document.querySelectorAll('.ML__mathfield')) {
+    if ('_mathfield' in mathfield) reparse(mathfield._mathfield as _Mathfield);
+  }
+}

src/public/mathfield-element.ts

@@ -37,7 +37,10 @@ import {
   isTouchCapable,
 } from '../ui/utils/capabilities';
 import { resolveUrl } from '../common/script-url';
-import { reparse, requestUpdate } from '../editor-mathfield/render';
+import {
+  reparseAllMathfields,
+  requestUpdate,
+} from '../editor-mathfield/render';
 import { reloadFonts, loadFonts } from '../core/fonts';
 import { defaultSpeakHook } from '../editor/speech';
 import { defaultReadAloudHook } from '../editor/speech-read-aloud';
@@ -49,6 +52,7 @@ import { Scrim } from '../ui/utils/scrim';
 import { isOffset, isRange, isSelection } from 'editor-model/selection-utils';
 import { KeyboardModifiers } from './ui-events-types';
 import { defaultInsertStyleHook } from 'editor-mathfield/styling';
+import { _MathEnvironment } from 'core/math-environment';
 
 /** @category MathJSON */
 export declare type Expression =
@@ -1046,9 +1050,23 @@ export class MathfieldElement extends HTMLElement implements Mathfield {
    * **Default**: `"numerator-denominator"`
    * @category Localization
    */
-  static fractionNavigationOrder:
+  static get fractionNavigationOrder():
     | 'numerator-denominator'
-    | 'denominator-numerator' = 'numerator-denominator';
+    | 'denominator-numerator' {
+    return _MathEnvironment.fractionNavigationOrder;
+  }
+  static set fractionNavigationOrder(
+    s: 'numerator-denominator' | 'denominator-numerator'
+  ) {
+    if (s !== 'numerator-denominator' && s !== 'denominator-numerator')
+      throw new Error('Invalid value');
+    if (_MathEnvironment.fractionNavigationOrder === s) return;
+
+    _MathEnvironment.fractionNavigationOrder = s;
+
+    // Invalidate all mathfields on the page
+    reparseAllMathfields();
+  }
 
   /**
    * A custom compute engine instance. If none is provided, a default one is
@@ -1098,9 +1116,7 @@ export class MathfieldElement extends HTMLElement implements Mathfield {
   static set isFunction(value: (command: string) => boolean) {
     this._isFunction = value;
 
-    document.querySelectorAll('math-field').forEach((el) => {
-      if (el instanceof MathfieldElement) reparse(el._mathfield);
-    });
+    reparseAllMathfields();
   }
 
   static async loadSound(

src/public/mathlive-ssr.ts

@@ -6,6 +6,8 @@
  *
  */
 
+import '../core/math-environment';
+
 import { Atom } from '../core/atom-class';
 
 import '../latex-commands/definitions';