fix(android): merging and splitting paragraph styles (#428)

# Summary

Fixes:
#402

## Test Plan

- enter 3 line code block text
- toggle style in second line
- notice that style is removed only for second line

## Screenshots / Videos


https://github.com/user-attachments/assets/62b25441-5a78-4512-9303-cbc8d7f5f3e9

## Compatibility

| OS      | Implemented |
| ------- | :---------: |
| iOS     |    ❌     |
| Android |    ✅     |

Author: exploIF

android/src/main/java/com/swmansion/enriched/textinput/styles/ParagraphStyles.kt

@@ -108,28 +108,34 @@ class ParagraphStyles(
     spannable.setSpan(span, safeStart, safeEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
   }
 
+  // Removes spans of the given type in the specified range.
+  // If the removed span intersects with the range, it will be split and the remaining part will be re-applied after the removal
+  // Returns true if any spans were removed, false otherwise
   private fun <T> removeSpansForRange(
     spannable: Spannable,
     start: Int,
     end: Int,
     clazz: Class<T>,
   ): Boolean {
     val ssb = spannable as SpannableStringBuilder
-    var finalStart = start
-    var finalEnd = end
-
     val spans = ssb.getSpans(start, end, clazz)
     if (spans.isEmpty()) return false
 
     for (span in spans) {
-      finalStart = ssb.getSpanStart(span).coerceAtMost(finalStart)
-      finalEnd = ssb.getSpanEnd(span).coerceAtLeast(finalEnd)
-
+      val spanStart = ssb.getSpanStart(span)
+      val spanEnd = ssb.getSpanEnd(span)
       ssb.removeSpan(span)
-    }
 
-    ssb.removeZWS(finalStart, finalEnd)
+      if (spanStart < start) {
+        setSpan(ssb, clazz, spanStart, start - 1)
+      }
+
+      if (spanEnd > end) {
+        setSpan(ssb, clazz, end + 1, spanEnd)
+      }
+    }
 
+    ssb.removeZWS(start, end)
     return true
   }
 

apps/example/src/App.tsx

@@ -437,7 +437,7 @@ const htmlStyle: HtmlStyle = {
   codeblock: {
     color: 'green',
     borderRadius: 8,
-    backgroundColor: 'aquamarine',
+    backgroundColor: 'grey',
   },
   code: {
     color: 'purple',