For use with a HiDPI screen, I would like to increase toolbar and menu item icons in GTK+ 2, possibly to 48×48 px.

For the Gimp, I am able to increase tool icons by specifying in the theme's gtkrc:

GimpToolPalette::tool-icon-size   = dialog

As far as I can tell, if there are no icons of the specified size available, smaller ones are scaled up. Great!

For all GTK+ 2 applications I tried increasing icon size by specifying in ~/.gtkrc-2.0:

gtk-toolbar-icon-size = GTK_ICON_SIZE_DIALOG

However, this has no effect, at least in the applications that I tested, for example Geeqie. Here the icons are still small.

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