File picker for library tables doesn't show sym-lib-table or fp-lib-table files

Description

In the library table dialog, when you browse for a library table (sym-lib-table or fp-lib-table), these files are not displayed in the file picker when the file filter is set for *.*.

When you initially open the browser, the file filter is blank, which allows the browser to show the files correctly:

image

If you click the dropdown, the only option is . and if you select that, then sym-lib-tables are hidden, and you can't go back to the initial state (well, you can cancel the browser and open it again)

image

Possibly GTK-specific

Steps to reproduce

  1. Preferences -> Manage Symbol Libraries
  2. Click the folder button next to the library path of a nested library table
  3. Browse to somewhere where a sym-lib-table file exists
  4. See it in the picker
  5. Change the file type filter to *.*
  6. see the table file disappeared

KiCad Version 

Application: KiCad x86_64 on x86_64

Version: 9.99.0-5038-ge393654e00-dirty, release build

Libraries:
	wxWidgets 3.2.8
	FreeType 2.14.1
	HarfBuzz 12.2.0
	FontConfig 2.17.1

Platform: Arch Linux, 64 bit, Little endian, wxGTK, X11, KDE, x11
OpenGL: Intel, Mesa Intel(R) Iris(R) Plus Graphics 655 (CFL GT3), 4.6 (Compatibility Profile) Mesa 25.2.7-arch1.1

	wxWidgets: 3.2.8 (wchar_t,wx containers) GTK+ 3.24
	Boost: 1.89.0
	OCC: 7.9.2
	Curl: 8.17.0
	ngspice: 45
	Compiler: GCC 15.2.1 with C++ ABI 1020

Build settings:
	KICAD_USE_EGL=ON
	KICAD_IPC_API=ON
	KICAD_USE_PCH=OFF

Locale: 
	Lang: en_US
	Enc: UTF-8
	Num: 1,234.5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)