Minimize EditText Spans 8/9: CustomStyleSpan

Summary:
This is part of a series of changes to minimize the number of spans committed to EditText, as a mitigation for platform issues on Samsung devices. See this [GitHub thread]( facebook#35936 (comment)) for greater context on the platform behavior.

This change allows us to strip CustomStyleSpan. We already set all but `fontVariant` on the underlying EditText, so we just need to route that through as well.

Note that because this span is non-parcelable, it is seemingly not subject to the buggy behavior on Samsung devices of infinitely cloning the spans, but non-parcelable spans have different issues on the devices (they disappear), so moving `fontVariant` to the top-level makes sense here.

Changelog:
[Android][Fixed] - Minimize EditText Spans 8/N: CustomStyleSpan

Differential Revision: https://internalfb.com/D44297384

fbshipit-source-id: 187dc063e4f3a8bfa03c33ee6c66d995351bb97e

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/text/CustomStyleSpan.java

@@ -71,6 +71,10 @@ public int getWeight() {
     return mFontFamily;
   }
 
+  public @Nullable String getFontFeatureSettings() {
+    return mFeatureSettings;
+  }
+
   private static void apply(
       Paint paint,
       int style,

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.java

@@ -518,6 +518,15 @@ public void setFontStyle(String fontStyleString) {
     }
   }
 
+  @Override
+  public void setFontFeatureSettings(String fontFeatureSettings) {
+    if ((fontFeatureSettings == null && getFontFeatureSettings() != null)
+        || !fontFeatureSettings.equals(getFontFeatureSettings())) {
+      super.setFontFeatureSettings(fontFeatureSettings);
+      mTypefaceDirty = true;
+    }
+  }
+
   public void maybeUpdateTypeface() {
     if (!mTypefaceDirty) {
       return;
@@ -529,6 +538,17 @@ public void maybeUpdateTypeface() {
         ReactTypefaceUtils.applyStyles(
             getTypeface(), mFontStyle, mFontWeight, mFontFamily, getContext().getAssets());
     setTypeface(newTypeface);
+
+    // Match behavior of CustomStyleSpan and enable SUBPIXEL_TEXT_FLAG when setting anything
+    // nonstandard
+    if (mFontStyle != UNSET
+        || mFontWeight != UNSET
+        || mFontFamily != null
+        || getFontFeatureSettings() != null) {
+      setPaintFlags(getPaintFlags() | Paint.SUBPIXEL_TEXT_FLAG);
+    } else {
+      setPaintFlags(getPaintFlags() & (~Paint.SUBPIXEL_TEXT_FLAG));
+    }
   }
 
   // VisibleForTesting from {@link TextInputEventsTestCase}.
@@ -738,6 +758,21 @@ public boolean test(CustomLetterSpacingSpan span) {
             }
           });
     }
+
+    stripSpansOfKind(
+        sb,
+        CustomStyleSpan.class,
+        new SpanPredicate<CustomStyleSpan>() {
+          @Override
+          public boolean test(CustomStyleSpan span) {
+            return span.getStyle() == mFontStyle
+                && ((span.getFontFamily() == null && mFontFamily == null)
+                    || (span.getFontFamily().equals(mFontFamily)))
+                && span.getWeight() == mFontWeight
+                && ((span.getFontFeatureSettings() == null && getFontFeatureSettings() == null)
+                    || (span.getFontFeatureSettings().equals(getFontFeatureSettings())));
+          }
+        });
   }
 
   private <T> void stripSpansOfKind(
@@ -808,6 +843,22 @@ private void restoreStyleEquivalentSpans(SpannableStringBuilder workingText) {
             spanFlags);
       }
     }
+
+    if (mFontStyle != UNSET
+        || mFontWeight != UNSET
+        || mFontFamily != null
+        || getFontFeatureSettings() != null) {
+      workingText.setSpan(
+          new CustomStyleSpan(
+              mFontStyle,
+              mFontWeight,
+              getFontFeatureSettings(),
+              mFontFamily,
+              getContext().getAssets()),
+          0,
+          workingText.length(),
+          spanFlags);
+    }
   }
 
   private static boolean sameTextForSpan(

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -69,6 +69,7 @@
 import com.facebook.react.views.text.ReactBaseTextShadowNode;
 import com.facebook.react.views.text.ReactTextUpdate;
 import com.facebook.react.views.text.ReactTextViewManagerCallback;
+import com.facebook.react.views.text.ReactTypefaceUtils;
 import com.facebook.react.views.text.TextAttributeProps;
 import com.facebook.react.views.text.TextInlineImageSpan;
 import com.facebook.react.views.text.TextLayoutManager;
@@ -413,6 +414,11 @@ public void setFontStyle(ReactEditText view, @Nullable String fontStyle) {
     view.setFontStyle(fontStyle);
   }
 
+  @ReactProp(name = ViewProps.FONT_VARIANT)
+  public void setFontVariant(ReactEditText view, @Nullable ReadableArray fontVariant) {
+    view.setFontFeatureSettings(ReactTypefaceUtils.parseFontVariant(fontVariant));
+  }
+
   @ReactProp(name = ViewProps.INCLUDE_FONT_PADDING, defaultBoolean = true)
   public void setIncludeFontPadding(ReactEditText view, boolean includepad) {
     view.setIncludeFontPadding(includepad);