ShellSection paddings are not reactive to the Navbar width

[Angel-Ponce]

What package has an issue

@svelteuidev/core

A clear and concise description of what the bug is

Take the following AppShell component example:

<AppShell>
 <Header zIndex={101} slot="header" height={60} fixed>
  <ContentHeader/>
 </Header>
 <Navbar
  hiddenBreakpoint={'sm'}
  slot="navbar"
  hidden={!$app.navbarOpen}
  fixed
  width={{
   sm: $app.navbarCollapsed ? 75 : 250
  }}
  class="duration-300 transition-all]"
 >
  <NavbarContent
   on:collapse={(e) => {
    setApp({ navbarCollapsed: e.detail });
   }}
  />
 </Navbar>
 <ShellSection grow>
  <div class={clsx('w-full duration-300 transition-all] p-4')}>
   <slot />
  </div>
 </ShellSection>
</AppShell>

Lets focus on the Navbar configuration: (by default $app.navbarCollapsed is false), so the initial width is 250

<Navbar
  hiddenBreakpoint={'sm'}
  slot="navbar"
  hidden={!$app.navbarOpen}
  fixed
  width={{
   sm: $app.navbarCollapsed ? 75 : 250
  }}
  class="duration-300 transition-all]"
>

The width property changes when $app.navbarCollapsed changes
and the CSS variables for the ShellSection takes only the first value of the navbar width:

.svelteui-c-nuDRu .svelteui-c-cRjbBW {
    flex: 1 1 0%;
    width: 100vw;
    box-sizing: border-box;
    min-height: 100vh;
    padding-top: calc(var(--svelteui-header-height, 0px) + 16px);
    padding-bottom: calc(var(--svelteui-footer-height, 0px) + 16px);
    padding-left: calc(var(--svelteui-navbar-width, 0px) + 16px);
    padding-right: calc(var(--svelteui-aside-width, 0px) + 16px);
}

@media (min-width: 769px)
<style>
:root {
    --svelteui-navbar-width: 250px;
}

When $app.navbarCollapsed changes and the Navbar width changes the --svelteui-navbar-width is not updated.

There are some wrong with my configuration, or this is a really bug?

In which browser(s) did the problem occur?

Other - list in description

Steps To Reproduce

1. Makes a simple AppShell component
2. Mutate the width of the Navbar component
3. Observe the behaviour with the AppShell content

Do you know how to fix the issue

No

Are you willing to participate in fixing this issue and create a pull request with the fix

No

Relevant Assets

bug.mp4