android - fix auto correct removes styles (#95)

Author: exploIF

android/src/main/java/com/swmansion/reactnativerichtexteditor/ReactNativeRichTextEditorView.kt

@@ -52,6 +52,7 @@ class ReactNativeRichTextEditorView : AppCompatEditText {
   val listStyles: ListStyles? = ListStyles(this)
   val parametrizedStyles: ParametrizedStyles? = ParametrizedStyles(this)
   var isSettingValue: Boolean = false
+  var isRemovingMany: Boolean = false
 
   val mentionHandler: MentionHandler? = MentionHandler(this)
   var richTextStyle: RichTextStyle = RichTextStyle(this, null)

android/src/main/java/com/swmansion/reactnativerichtexteditor/utils/EditorSelection.kt

@@ -35,7 +35,7 @@ class EditorSelection(private val editorView: ReactNativeRichTextEditorView) {
 
     if (isZeroWidthSelection() && !editorView.isSettingValue) {
       editorView.setSelection(start + 1)
-      return
+      shouldValidateStyles = false
     }
 
     if (!shouldValidateStyles) return
@@ -62,8 +62,15 @@ class EditorSelection(private val editorView: ReactNativeRichTextEditorView) {
   fun validateStyles() {
     val state = editorView.spanState ?: return
 
-    for ((style, config) in EditorSpans.inlineSpans) {
-      state.setStart(style, getInlineStyleStart(config.clazz))
+    // We don't validate inline styles when removing many characters at once
+    // We don't want to remove styles on auto-correction
+    // If user removes many characters at once, we want to keep the styles config
+    if (!editorView.isRemovingMany) {
+      for ((style, config) in EditorSpans.inlineSpans) {
+        state.setStart(style, getInlineStyleStart(config.clazz))
+      }
+    } else {
+      editorView.isRemovingMany = false
     }
 
     for ((style, config) in EditorSpans.paragraphSpans) {

android/src/main/java/com/swmansion/reactnativerichtexteditor/watchers/EditorTextWatcher.kt

@@ -18,6 +18,7 @@ class EditorTextWatcher(private val editorView: ReactNativeRichTextEditorView) :
   override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
     endCursorPosition = start + count
     editorView.layoutManager.measureSize(s ?: "")
+    editorView.isRemovingMany = !editorView.isSettingValue && before > count + 1
   }
 
   override fun afterTextChanged(s: Editable?) {