fonts: use toast notification for missing glyph notification

Popping open the config error window is a bit of overkill

Cargo.lock

@@ -4410,6 +4410,7 @@ dependencies = [
  "unicode-segmentation",
  "walkdir",
  "wezterm-term",
+ "wezterm-toast-notification",
  "winapi 0.3.9",
  "window",
 ]

wezterm-font/Cargo.toml

@@ -28,6 +28,7 @@ unicode-segmentation = "1.7"
 unicode-general-category = "0.3"
 walkdir = "2"
 wezterm-term = { path = "../term", features=["use_serde"] }
+wezterm-toast-notification = { path = "../wezterm-toast-notification" }
 window = { path = "../window" }
 
 [target.'cfg(any(target_os = "android", all(unix, not(target_os = "macos"))))'.dependencies]

wezterm-font/src/lib.rs

@@ -12,8 +12,10 @@ use std::cell::RefCell;
 use std::collections::{HashMap, HashSet};
 use std::rc::{Rc, Weak};
 use std::sync::{Arc, Mutex};
+use std::time::Duration;
 use thiserror::Error;
 use wezterm_term::CellAttributes;
+use wezterm_toast_notification::ToastNotification;
 use window::default_dpi;
 
 mod hbwrap;
@@ -305,16 +307,33 @@ impl FontConfigInner {
                     .collect::<String>();
 
                 if config.warn_about_missing_glyphs {
-                    config::show_error(&format!(
+                    let url = "https://wezfurlong.org/wezterm/config/fonts.html";
+                    log::warn!(
                         "No fonts contain glyphs for these codepoints: {}.\n\
                      Placeholder 'Last Resort' glyphs are being displayed instead.\n\
                      You may wish to install additional fonts, or adjust your\n\
                      configuration so that it can find them.\n\
-                    https://wezfurlong.org/wezterm/config/fonts.html\n\
-                    has more information about configuring fonts.\n\
+                     {} has more information about configuring fonts.\n\
                      Set warn_about_missing_glyphs=false to suppress this message.",
+                        fallback_str.escape_unicode(),
+                        url,
+                    );
+
+                    ToastNotification {
+                        title: "Font problem".to_string(),
+                        message: format!(
+                            "No fonts contain glyphs for these codepoints: {}.\n\
+                            Placeholder glyphs are being displayed instead.\n\
+                            You may wish to install additional fonts, or adjust\n\
+                            your configuration so that it can find them.\n\
+                            Set warn_about_missing_glyphs=false to suppress this\n\
+                            message.",
                             fallback_str.escape_unicode()
-                    ));
+                        ),
+                        url: Some(url.to_string()),
+                        timeout: Some(Duration::from_secs(15)),
+                    }
+                    .show();
                 } else {
                     log::warn!(
                         "No fonts contain glyphs for these codepoints: {}",

wezterm-toast-notification/src/lib.rs

@@ -10,6 +10,12 @@ pub struct ToastNotification {
     pub timeout: Option<std::time::Duration>,
 }
 
+impl ToastNotification {
+    pub fn show(self) {
+        show(self)
+    }
+}
+
 #[cfg(windows)]
 use crate::windows as backend;
 #[cfg(all(not(target_os = "macos"), not(windows), not(target_os = "freebsd")))]