[CP][Impeller] Fix text glitch when returning to foreground. (#163754)

Fixes https://github.com/flutter/flutter/issues/163730
Fixes https://github.com/flutter/flutter/issues/163452

CHANGELOG.md

@@ -42,6 +42,7 @@ INTERNAL NOTE
 
 - [flutter/163304](https://github.com/flutter/flutter/issues/163304) Fixes crash when using backdrop filter on GLES backend.
 - [flutter/161334](https://github.com/flutter/flutter/issues/161334) Disable Vulkan on certain Xclipse GPU models.
+- [flutter/163730](https://github.com/flutter/flutter/issues/163730) Fixes text rendering artifacts when returning application to foreground.
 - [flutter/163429](https://github.com/flutter/flutter/issues/163429) Fixes jittery scrolling on iOS devices.
 
 - [flutter/163236](https://github.com/flutter/flutter/pull/163236) Disable Vulkan on older Exynos SoC to work around Android HardwareBuffer import error.

engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.cc

@@ -417,13 +417,17 @@ TypographerContextSkia::CollectNewGlyphs(
   size_t generation_id = atlas->GetAtlasGeneration();
   intptr_t atlas_id = reinterpret_cast<intptr_t>(atlas.get());
   for (const auto& frame : text_frames) {
-    auto [frame_generation_id, frame_atlas_id] =
-        frame->GetAtlasGenerationAndID();
-    if (atlas->IsValid() && frame->IsFrameComplete() &&
+// TODO(jonahwilliams): re-enable glyph condition once
+// https://github.com/flutter/flutter/issues/163730 is fixed
+#if false
+  auto [frame_generation_id, frame_atlas_id] =
+  frame->GetAtlasGenerationAndID();
+        if (atlas->IsValid() && frame->IsFrameComplete() &&
         frame_generation_id == generation_id && frame_atlas_id == atlas_id &&
         !frame->GetFrameBounds(0).is_placeholder) {
       continue;
     }
+#endif  // false
     frame->ClearFrameBounds();
     frame->SetAtlasGeneration(generation_id, atlas_id);