Splitter k-pane-static class is not reapplied after expanding a pane

[mbechev]

Description

The Splitter dynamically adds and removes k-pane-static class to panes when resizing them. However, when collapsing and expanding a pane the class has not been reapplied to the pane.

The following screen video demonstrates the steps to reproduce this inconsistency:

Screen.Recording.2025-05-12.at.13.24.29.mov

Test Example:

https://stackblitz.com/edit/angular-msq8kccm?file=src%2Fapp%2Fapp.component.ts

Actual Behavior

k-pane-static is removed from the DOM, but not added back when expanding a pane.

Expected Behavior

The CSS classes should be consistent in those cases and should exist when the panes are expanded.