Crash on Show in Filesystem when FileSystem is at the bottom

[kitbdev]

Tested versions

Godot v4.3.dev (10e1114) (since #86765)

System information

Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2070 (NVIDIA; 31.0.15.4665) - Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz (12 Threads)

Issue description

• related Allow to move FileSystem dock to bottom and drag resources across bottom docks #86765

The Editor will crash when Show in Filesystem is called from anywhere while the Filesystem is at the bottom panel.

FileSystemDock::navigate_to_path() assumes that the FileSystem is in a TabContainer if it is in the same window, but when it is at the bottom panel it is not, so the cast fails and is null when set_current_tab() is called on it.

I am working on a PR that will fix this issue.

Steps to reproduce

• Move the FileSystem to the Bottom Panel
• Click on Show in Filesystem from the context menu on a Scene root, script in the script list, or resource in the inspector.
• The editor crashes.

Minimal reproduction project (MRP)

N/A