The taskbar shown on freeform display taskbar when
enable_desktop_taskbar_on_freeform_displays feature is enabled is
expected to remain in persistent taskbar state (and never
transition to transient taskbar). Given that transitions to transient
taskbar is not expected, use actual peristent taskbar sizing to layout
the taskbar in this case (similar to three-button navigation taskbar).
Bug: 390665752
Flag: com.android.window.flags.enable_desktop_taskbar_on_freeform_displays
Test: manual on desktop device - keep opening apps in desktop mode, and
verify that taskbar does not enter overflow based on transient
taskbar icon dimensions (i.e. that taskbar keeps filling up until
it hits intended horizontal margins)
Change-Id: If6cdadccf0fe4da1462b437a13def78f6050e3bb
Toni Barzic
b831f59d6c