pub fn set_text_scale(s: f32)Expand description
Set the global text scale multiplier applied to every resolved font
size (the accessibility “large text” factor). Clamped to [0.5, 3.0].
The run loop keeps it synced to the desktop’s
org.gnome.desktop.interface text-scaling-factor GSettings key and
repaints on change, so apps normally never call this themselves;
embedders driving crate::core::UiSurface directly do.