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Prevent a disappearing stretchy arrow in CHTML. (mathjax/MathJax#3457) #1381

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Merged
merged 1 commit into from
Nov 11, 2025
Merged

Prevent a disappearing stretchy arrow in CHTML. (mathjax/MathJax#3457) #1381

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99 changes: 55 additions & 44 deletions ts/output/common/Wrappers/mo.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -359,53 +359,64 @@ export function CommonMoMixin<
* @override
*/
public getStretchedVariant(WH: number[], exact: boolean = false) {
if (this.stretch.dir !== DIRECTION.None) {
let D = this.getWH(WH);
const min = this.getSize('minsize', 0);
const max = this.getSize('maxsize', Infinity);
const mathaccent = this.node.getProperty('mathaccent');
//
// Clamp the dimension to the max and min
// then get the target size via TeX rules
//
D = Math.max(min, Math.min(max, D));
const df = this.font.params.delimiterfactor / 1000;
const ds = this.font.params.delimitershortfall;
const m =
min || exact
? D
: mathaccent
? Math.min(D / df, D + ds)
: Math.max(D * df, D - ds);
//
// Look through the delimiter sizes for one that matches
//
const delim = this.stretch;
const c = delim.c || this.getText().codePointAt(0);
let i = 0;
if (delim.sizes) {
for (const d of delim.sizes) {
if (d >= m) {
if (mathaccent && i) {
i--;
}
this.setDelimSize(c, i);
return;
if (this.stretch.dir === DIRECTION.None) {
return;
}
let D = this.getWH(WH);
const min = this.getSize('minsize', 0);
const max = this.getSize('maxsize', Infinity);
const mathaccent = this.node.getProperty('mathaccent');
//
// Clamp the dimension to the max and min
// then get the target size via TeX rules
//
D = Math.max(min, Math.min(max, D));
const df = this.font.params.delimiterfactor / 1000;
const ds = this.font.params.delimitershortfall;
const m =
min || exact
? D
: mathaccent
? Math.min(D / df, D + ds)
: Math.max(D * df, D - ds);
//
// Get the delimiter character, and look up the
// delimiter data again if we have already stretched it
// (in case a fixed size set the delim.c). See #3457.
//
const C = this.getText().codePointAt(0);
let delim = this.stretch;
if (this.size) {
this.stretch = delim = this.font.getDelimiter(C) as DD;
this.size = null;
}
const c = delim.c || C;
//
// Look through the delimiter sizes for one that matches
//
let i = 0;
if (delim.sizes) {
for (const d of delim.sizes) {
if (d >= m) {
if (mathaccent && i) {
i--;
}
i++;
this.setDelimSize(c, i);
return;
}
i++;
}
//
// No size matches, so if we can make multi-character delimiters,
// record the data for that, otherwise, use the largest fixed size.
//
if (delim.stretch) {
this.size = -1;
this.invalidateBBox();
this.getStretchBBox(WH, this.checkExtendedHeight(D, delim), delim);
} else {
this.setDelimSize(c, i - 1);
}
}
//
// No size matches, so if we can make multi-character delimiters,
// record the data for that, otherwise, use the largest fixed size.
//
if (delim.stretch) {
this.size = -1;
this.invalidateBBox();
this.getStretchBBox(WH, this.checkExtendedHeight(D, delim), delim);
} else {
this.setDelimSize(c, i - 1);
}
}

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