Fix end ident followed by MATCH

Author: adpi2

compiler/src/dotty/tools/dotc/parsing/Scanners.scala

@@ -766,6 +766,9 @@ object Scanners {
           if lookahead.token == EOF
           || source.offsetToLine(lookahead.offset) > endLine
           then return true
+
+          if lookahead.token == LBRACE && rewriteToIndent then
+            patch(Span(offset, offset + 3), s"`end`")
       false
 
     /** Is there a blank line between the current token and the last one?

tests/rewrites/indent-rewrite.check

@@ -162,6 +162,7 @@ do not indent in a multiline string"""
     o match
     case Some(x) => x
     case None => ""
+    end match
 
     o match
     case None =>

tests/rewrites/indent-rewrite.scala

@@ -182,6 +182,7 @@ m10 { 5 } {
     o match
     case Some(x) => x
     case None => ""
+    end match
 
     o match {
     case None =>