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[213_23] Fix piecewise function LaTeX import with aligned environment #2889

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[213_23] Fix piecewise function LaTeX import with aligned environment #2889

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15 changes: 15 additions & 0 deletions devel/213_23.md
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# [213_23] Fix piecewise function LaTeX import with aligned environment

Issue: https://github.com/MoganLab/mogan/issues/2733

When importing LaTeX code like `\left\{\begin{aligned}...\end{aligned}\right.`, the `aligned` environment inside `\left\{...\right.` was not recognized as a matrix-like environment, causing broken layout for piecewise functions.

## Root Cause
The `aligned` environment was not handled in `finalize_pmatrix` or `parse_pmatrix`, so it was passed through as raw BEGIN/END tokens instead of being converted to a proper table structure.

## Changes
- `src/Plugins/Tex/fromtex_post.cpp`:
- Added `aligned` as a recognized environment in `finalize_pmatrix`, converting it to `tabular*` format (same as `array`)
- Added `END "aligned"` as a break condition in `parse_pmatrix`

The `\left\{` and `\right.` delimiters are already handled by the existing LEFT/RIGHT processing, so the aligned content inside will now be properly laid out as a table within the braces.
2 changes: 2 additions & 0 deletions src/Plugins/Tex/fromtex_post.cpp
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Expand Up @@ -338,6 +338,7 @@ parse_pmatrix (tree& r, tree t, int& i, string lb, string rb, string fm) {
else if (v == tree (END, "bmatrix")) break;
else if (v == tree (END, "vmatrix")) break;
else if (v == tree (END, "smallmatrix")) break;
else if (v == tree (END, "aligned")) break;
else if (v == tree (APPLY, "hline")) {
int howmany= 1;
while (i + 1 < N (t) &&
Expand Down Expand Up @@ -446,6 +447,7 @@ finalize_pmatrix (tree t) {
u[i][0] == "tabularx" || u[i][0] == "tabularx*")
parse_pmatrix (r, u, i, "", "", "tabular*");
else if (u[i][0] == "cases") parse_pmatrix (r, u, i, "", "", "choice");
else if (u[i][0] == "aligned") parse_pmatrix (r, u, i, "", "", "tabular*");
else if (u[i][0] == "stack") parse_pmatrix (r, u, i, "", "", "stack");
else if (u[i][0] == "matrix")
parse_pmatrix (r, u, i, "", "", "tabular*");
Expand Down