GTK4: Here we go down this rabbit hole again. GTK 4.10 is deprecating tons of functionality with deficient replacement APIs. GtkComboBox is deprecated now suggesting GtkDropDown as a replacement, however GtkDropDown is just a list selection and does not have an editable entryfield version. I haven't completely gone through the changes, but I will attempt to switch to the new APIs where possible to reduce the number of deprecation warnings. This is the first set switching gtk_widget_hide/show() to use gtk_widget_set_visible() instead. This removes about 50 warnings.

/* XPM */
static char * FOLDER_xpm[] = {
"16 16 10 1",
" 	c None",
".	c #000000",
"+	c #AA9200",
"@	c #FFFFAA",
"#	c #FFDB55",
"$	c #AA6D00",
"%	c #F7F7F7",
"&	c #D59255",
"*	c #FFDBAA",
"=	c #D5B655",
"                ",
"  &&&&          ",
" &%%%%&         ",
"&%@@@@%+++++$   ",
"&@@@@@@%%%%%$   ",
"&@*++++++++++++ ",
"&#+%%%%%%%%%*%+$",
"&#+@@@@@@@@@#@+$",
"&#+@@@@@@@@@.@+$",
"&#+@@**@**@@=@+$",
"&#+@########=@+$",
"&#+@########=@+$",
" ++++++++++++++$",
"  $$$$$$$$$$$$$ ",
"                ",
"                "};