More help with Steam Deck scaling

book/src/troubleshooting.md

@@ -23,4 +23,10 @@ Solutions to some known problems follow:
 
 This happens on some systems, *particularly Steam Deck*, for unknown reasons,
 but can be fixed by setting the environment variable
-`WINIT_X11_SCALE_FACTOR=1.0`.
+`WINIT_X11_SCALE_FACTOR=1.0`. If you launch UKMM from the terminal, running
+it as `WINIT_X11_SCALE_FACTOR=1.0 ukmm` from the UKMM folder will work.
+Otherwise, you may try setting it in your `~/.profile` or `~/.Xprofile`, e.g.
+by adding the line `export WINIT_X11_SCALE_FACTOR=1.0`. Also note that some
+desktop environments contain tools for setting environment variables. If you
+need help with this, ArchWiki has an [excellent article on the
+topic](https://wiki.archlinux.org/title/environment_variables).

src/gui.rs

@@ -283,7 +283,8 @@ impl App {
     fn new(cc: &eframe::CreationContext) -> Self {
         if option_env!("UPDATE_PLATFORM").unwrap_or_default() == "steamdeck" {
             cc.egui_ctx.set_pixels_per_point(
-                option_env!("WINIT_X11_SCALE_FACTOR")
+                std::env::var("WINIT_X11_SCALE_FACTOR")
+                    .ok()
                     .and_then(|v| v.parse().ok())
                     .unwrap_or(1.0),
             );