fix wrong hover and signature for method

with varargs and overloads

Author: sumneko

changelog.md

@@ -1,6 +1,7 @@
 # changelog
 
 ## 3.6.26
+* `FIX` wrong hover and signature for method with varargs and overloads
 * `FIX` [#2224]
 
 [#2224]: https://github.com/LuaLS/lua-language-server/issues/2224

script/vm/function.lua

@@ -372,8 +372,14 @@ function vm.isVarargFunctionWithOverloads(func)
     if not func.args then
         return false
     end
-    if not func.args[1] or func.args[1].type ~= '...' then
-        return false
+    if func.args[1] and func.args[1].type == 'self' then
+        if not func.args[2] or func.args[2].type ~= '...' then
+            return false
+        end
+    else
+        if not func.args[1] or func.args[1].type ~= '...' then
+            return false
+        end
     end
     if not func.bindDocs then
         return false

test/crossfile/hover.lua

@@ -1695,6 +1695,26 @@ function f(x: number, y: number)
 ```]]
 }
 
+TEST { { path = 'a.lua', content = [[
+---@overload fun(self: self, x: number)
+---@overload fun(self: self, x: number, y: number)
+function M:f(...)
+end
+
+M:<?f?>
+]] },
+hover = [[
+```lua
+(method) M:f(x: number)
+```
+
+---
+
+```lua
+(method) M:f(x: number, y: number)
+```]]
+}
+
 TEST { {path = 'a.lua', content = [[
 ---@class A