fix(pivot-grid): prevent selector dimensions list from being clipped when scrolled

[simeonoff]

Closes #17585

Description

The pivot grid selector's dimensions/values list (.igx-pivot-data-selector__filter) did not have flex-shrink: 0 set on itself or on the inner igx-list. When the overall selector panel didn't have enough vertical space (e.g. larger row density, more checked dimensions, shorter grid), the flex column layout shrank the filter container below the height its content needs. Since the container also has overflow: hidden, this silently clipped the bottom of the scrollable list, cutting off the last item even when fully scrolled.

Added flex-shrink: 0 to .igx-pivot-data-selector__filter and its inner igx-list in projects/igniteui-angular/grids/pivot-grid/src/themes/_base.scss so the section keeps its natural min/max height and scrolls properly instead of being clipped.

Motivation / Context

Pivot grid selector dimensions list does not scroll to the end.

Type of Change (check all that apply):

• Bug fix

Component(s) / Area(s) Affected:

Pivot Grid (selector dimensions/values list)

How Has This Been Tested?

• Manual testing

Test Configuration:

• Browser(s): Chrome

[Copilot]

🟢 Approval recommended

The focused fix addresses the clipping issue; the remaining test suggestion is a minor nit.

Pull request overview

Fixes Pivot Grid selector list clipping by preventing the filter container and inner list from shrinking.

Changes:

• Adds flex-shrink: 0 to the filter container.
• Adds flex-shrink: 0 to the inner list.

File summaries

File	Description
projects/igniteui-angular/grids/pivot-grid/src/themes/_base.scss	Preserves the selector list’s usable height during flex layout.

Review details

Suppressed comments (1)

projects/igniteui-angular/grids/pivot-grid/src/themes/_base.scss:114

• This fixes a user-visible scrolling regression, but the existing pivot-data-selector.spec.ts only checks which items render and does not cover a constrained selector/list being scrolled to its end. Please add a regression test that exercises the short-height case and verifies the last item is fully reachable, so a future flex-layout change cannot silently reintroduce this bug.

            flex-shrink: 0;

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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