iconhelper: Query size via CSS
Sync with upstream change: https://github.com/GNOME/gtk/commit/c6c342750753efc77d0221db7f0465643f96882a Ref: plasma/breeze-gtk#7 (cherry picked from commit 21ea3288)
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Sync with upstream change: https://github.com/GNOME/gtk/commit/c6c342750753efc77d0221db7f0465643f96882a Ref: plasma/breeze-gtk#7 (cherry picked from commit 21ea3288)