fix(table-core): skip state update in toggleExpanded when state is unchanged

[isaackaara]

Problem

Calling row.toggleExpanded(false) when the row is already collapsed (or row.toggleExpanded(true) when already expanded) triggers onExpandedChange and causes an unnecessary re-render of the entire table.

As reported in #6136, this causes noticeable UI freezes when toggleExpanded is called in high-frequency event handlers like onBlur.

Root Cause

The toggleExpanded function passes an updater to table.setExpanded() unconditionally, even when the desired state matches the current state. While the updater returns old (same reference) when no change is needed, onExpandedChange is still invoked with the updater function, triggering React's state update flow.

Fix

Added an early return that checks the current expanded state via row.getIsExpanded() before calling table.setExpanded(). If the desired state matches the current state, the function returns immediately, avoiding the unnecessary state update entirely.

Before (workaround required)

// User had to manually check state before calling toggleExpanded
if (newValue === '') row.getIsExpanded() && row.toggleExpanded(false)
else !row.getIsExpanded() && row.toggleExpanded(true)

After

// toggleExpanded now handles this internally
if (newValue === '') row.toggleExpanded(false)
else row.toggleExpanded(true)

Closes #6136

[changeset-bot]

🦋 Changeset detected

Latest commit: 6cd1aa9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@tanstack/table-core	Patch
@tanstack/angular-table	Patch
@tanstack/lit-table	Patch
@tanstack/qwik-table	Patch
@tanstack/react-table	Patch
@tanstack/solid-table	Patch
@tanstack/svelte-table	Patch
@tanstack/vue-table	Patch
@tanstack/react-table-devtools	Patch

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