Fix flickering during resize on Wayland

This also fixes an issue of windows not being rendered while resizing.

Fixes #6069.

2 files changed, 9 insertions, 8 deletions

diff --git a/alacritty/src/renderer/text/gles2.rs b/alacritty/src/renderer/text/gles2.rs
index 32aaa173..01470813 100644
--- a/alacritty/src/renderer/text/gles2.rs
+++ b/alacritty/src/renderer/text/gles2.rs
@@ -463,7 +463,7 @@ pub struct TextShaderProgram {
     ///
     /// If GL_EXT_blend_func_extended is not available, the rendering is split into 4 passes.
     /// One is used for the background and the rest to perform subpixel text rendering according to
-    /// https://github.com/servo/webrender/blob/master/webrender/doc/text-rendering.md.
+    /// <https://github.com/servo/webrender/blob/master/webrender/doc/text-rendering.md>.
     ///
     /// Rendering is split into three passes.
     u_rendering_pass: GLint,
diff --git a/alacritty/src/renderer/text/glyph_cache.rs b/alacritty/src/renderer/text/glyph_cache.rs
index b57b10b7..72415900 100644
--- a/alacritty/src/renderer/text/glyph_cache.rs
+++ b/alacritty/src/renderer/text/glyph_cache.rs
@@ -264,19 +264,22 @@ impl GlyphCache {
         loader.load_glyph(&glyph)
     }
 
-    /// Clear currently cached data in both GL and the registry.
-    pub fn clear_glyph_cache<L: LoadGlyph>(&mut self, loader: &mut L) {
+    /// Reset currently cached data in both GL and the registry to default state.
+    pub fn reset_glyph_cache<L: LoadGlyph>(&mut self, loader: &mut L) {
         loader.clear();
-        self.cache = HashMap::default();
+        self.cache = Default::default();
 
         self.load_common_glyphs(loader);
     }
 
-    pub fn update_font_size<L: LoadGlyph>(
+    /// Update the inner font size.
+    ///
+    /// NOTE: To reload the renderers's fonts [`Self::reset_glyph_cache`] should be called
+    /// afterwards.
+    pub fn update_font_size(
         &mut self,
         font: &Font,
         scale_factor: f64,
-        loader: &mut L,
     ) -> Result<(), crossfont::Error> {
         // Update dpi scaling.
         self.rasterizer.update_dpr(scale_factor as f32);
@@ -304,8 +307,6 @@ impl GlyphCache {
         self.metrics = metrics;
         self.builtin_box_drawing = font.builtin_box_drawing;
 
-        self.clear_glyph_cache(loader);
-
         Ok(())
     }