fixed text box size for loading screens

ezgui/src/event_ctx.rs

@@ -200,6 +200,8 @@ impl<'a> LoadingScreen<'a> {
         self.last_drawn = Some(Instant::now());
 
         let mut txt = Text::prompt(&self.title);
+        txt.override_width = Some(self.canvas.window_width * 0.8);
+        txt.override_height = Some(self.canvas.window_height * 0.8);
         for l in &self.lines {
             txt.add_line(l.to_string());
         }

ezgui/src/text.rs

@@ -43,6 +43,7 @@ pub struct Text {
     lines: Vec<(Option<Color>, Vec<TextSpan>)>,
     bg_color: Option<Color>,
     pub(crate) override_width: Option<f64>,
+    pub(crate) override_height: Option<f64>,
 }
 
 impl Text {
@@ -51,6 +52,7 @@ impl Text {
             lines: Vec::new(),
             bg_color: Some(BG_COLOR),
             override_width: None,
+            override_height: None,
         }
     }
 
@@ -65,6 +67,7 @@ impl Text {
             lines: Vec::new(),
             bg_color,
             override_width: None,
+            override_height: None,
         }
     }
 
@@ -178,7 +181,7 @@ impl Text {
         }
         (
             self.override_width.unwrap_or_else(|| f64::from(max_width)),
-            height,
+            self.override_height.unwrap_or_else(|| f64::from(height)),
         )
     }
 }