[language-java] Add highlights for variables…

…when assigning, reassigning, or incrementing.

Also add `++` and `--` as operators.

packages/language-java/grammars/tree-sitter-java/highlights.scm

@@ -217,9 +217,13 @@
     (identifier) @variable.parameter.lambda.java))
 
 (variable_declarator
-  name: (identifier) @variable.other.assignment.java)
+  name: (identifier) @variable.other.declaration.java)
 
+(assignment_expression
+  left: (identifier) @variable.other.assignment.java)
 
+(update_expression
+  (identifier) @variable.other.assignment.java)
 
 ; PACKAGES
 ; ========
@@ -359,6 +363,8 @@
 (binary_expression
   ["&" "|" "^" "~" "<<" ">>" ">>>"] @keyword.operator.bitwise.java)
 
+["++" "--"] @keyword.operator.increment.java
+
 "." @keyword.operator.accessor.dot.java
 "::" @keyword.operator.accessor.method-reference.java