gpui: Make TextSystem::line_wrapper non-fallible. (#4022)

Editors WrapMap could become desynchronised if user had an invalid font
specified in their config. Compared to Zed1, WrapMap ignored the
resolution failure instead of panicking. Now, if there's an invalid font
in the user config, we just fall back to an arbitrary default.


Release Notes:
- Fixed the editor panic in presence of invalid font name in the config
(fixes https://github.com/zed-industries/community/issues/2397)

---------

Co-authored-by: Conrad <conrad@zed.dev>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/gpui/src/text_system.rs

@@ -364,28 +364,20 @@ impl TextSystem {
         self.line_layout_cache.start_frame()
     }
 
-    pub fn line_wrapper(
-        self: &Arc<Self>,
-        font: Font,
-        font_size: Pixels,
-    ) -> Result<LineWrapperHandle> {
+    pub fn line_wrapper(self: &Arc<Self>, font: Font, font_size: Pixels) -> LineWrapperHandle {
         let lock = &mut self.wrapper_pool.lock();
-        let font_id = self.font_id(&font)?;
+        let font_id = self.resolve_font(&font);
         let wrappers = lock
             .entry(FontIdWithSize { font_id, font_size })
             .or_default();
-        let wrapper = wrappers.pop().map(anyhow::Ok).unwrap_or_else(|| {
-            Ok(LineWrapper::new(
-                font_id,
-                font_size,
-                self.platform_text_system.clone(),
-            ))
-        })?;
+        let wrapper = wrappers.pop().unwrap_or_else(|| {
+            LineWrapper::new(font_id, font_size, self.platform_text_system.clone())
+        });
 
-        Ok(LineWrapperHandle {
+        LineWrapperHandle {
             wrapper: Some(wrapper),
             text_system: self.clone(),
-        })
+        }
     }
 
     pub fn raster_bounds(&self, params: &RenderGlyphParams) -> Result<Bounds<DevicePixels>> {