Enable GVFS/network filesystem visibility in file dialogs

On GTK, wxFileDialog defaults to local_only mode which hides GVFS-mounted
filesystems like Google Drive, SMB shares, and external drives mounted
through GVFS. This adds a platform-specific function that disables
local_only mode to show these network/virtual filesystems.

Apply AllowNetworkFileSystems to all file dialogs across KiCad
to ensure directories on network filesystems are visible when
browsing for files.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/14372

bitmap2component/bitmap2cmp_frame.cpp

@@ -42,6 +42,7 @@
 
 #include <wx/filedlg.h>
 #include <wx/msgdlg.h>
+#include <kiplatform/ui.h>
 
 
 #define DEFAULT_DPI 300     // the image DPI used in formats that do not define a DPI
@@ -401,6 +402,8 @@ void BITMAP2CMP_FRAME::OnLoadFile()
     wxFileDialog fileDlg( this, _( "Choose Image" ), path, wxEmptyString,
                           FILEEXT::ImageFileWildcard(), wxFD_OPEN | wxFD_FILE_MUST_EXIST );
 
+    KIPLATFORM::UI::AllowNetworkFileSystems( &fileDlg );
+
     if( fileDlg.ShowModal() != wxID_OK )
         return;
 
@@ -442,6 +445,8 @@ void BITMAP2CMP_FRAME::ExportDrawingSheetFormat()
     wxFileDialog fileDlg( this, _( "Create Drawing Sheet File" ), path, wxEmptyString,
                           FILEEXT::DrawingSheetFileWildcard(), wxFD_SAVE | wxFD_OVERWRITE_PROMPT );
 
+    KIPLATFORM::UI::AllowNetworkFileSystems( &fileDlg );
+
     if( fileDlg.ShowModal() != wxID_OK )
         return;
 
@@ -475,6 +480,8 @@ void BITMAP2CMP_FRAME::ExportPostScriptFormat()
     wxFileDialog fileDlg( this, _( "Create PostScript File" ), path, wxEmptyString,
                           FILEEXT::PSFileWildcard(), wxFD_SAVE | wxFD_OVERWRITE_PROMPT );
 
+    KIPLATFORM::UI::AllowNetworkFileSystems( &fileDlg );
+
     if( fileDlg.ShowModal() != wxID_OK )
         return;
 
@@ -509,6 +516,8 @@ void BITMAP2CMP_FRAME::ExportEeschemaFormat()
                           FILEEXT::KiCadSymbolLibFileWildcard(),
                           wxFD_SAVE | wxFD_OVERWRITE_PROMPT );
 
+    KIPLATFORM::UI::AllowNetworkFileSystems( &fileDlg );
+
     if( fileDlg.ShowModal() != wxID_OK )
         return;
 
@@ -542,6 +551,8 @@ void BITMAP2CMP_FRAME::ExportPcbnewFormat()
                           FILEEXT::KiCadFootprintLibFileWildcard(),
                           wxFD_SAVE | wxFD_OVERWRITE_PROMPT );
 
+    KIPLATFORM::UI::AllowNetworkFileSystems( &fileDlg );
+
     if( fileDlg.ShowModal() != wxID_OK )
         return;