reposition glyph before passing it to ab_glyph to normalize its rende…

…ring

The result of layout of sequence of glyphs causes individuals to have fractional positions, but since glyph renderings are reused for future instances of that glyph, this produces errors. This change accepts the errors but repositions the glyph to "0, 0" in an effort to get the cleanest possible rendering.

crates/bevy_text/src/glyph_brush.rs

@@ -73,8 +73,11 @@ impl GlyphBrush {
 
         let mut positioned_glyphs = Vec::new();
         for sg in glyphs {
-            let glyph_id = sg.glyph.id;
-            if let Some(outlined_glyph) = font.font.outline_glyph(sg.glyph) {
+            let SectionGlyph{section_index:_,byte_index:_,mut glyph,font_id:_} = sg;
+            let glyph_id = glyph.id;
+            let base_x = glyph.position.x.floor ();
+            glyph.position.x = 0.;
+            if let Some(outlined_glyph) = font.font.outline_glyph(glyph) {
                 let bounds = outlined_glyph.px_bounds();
                 let handle_font_atlas: Handle<FontAtlasSet> = handle.as_weak();
                 let font_atlas_set = font_atlas_set_storage
@@ -92,10 +95,10 @@ impl GlyphBrush {
                 let glyph_width = glyph_rect.width();
                 let glyph_height = glyph_rect.height();
 
-                let x = bounds.min.x + glyph_width / 2.0 - min_x;
+                let x = base_x + bounds.min.x + glyph_width / 2.0 - min_x;
                 // the 0.5 accounts for odd-numbered heights (bump up by 1 pixel)
                 // max_y = text block height, and up is negative (whereas for transform, up is positive)
-                let y = max_y - bounds.max.y + glyph_height / 2.0 + 0.5;
+                let y = max_y - bounds.max.y + glyph_height / 2.0;
                 let position = Vec2::new(x, y);
 
                 positioned_glyphs.push(PositionedGlyph {