Fix setResizable glitch on titleBarStyle="hidden"

Author: wisetarman

windows/window_manager.cpp

@@ -450,6 +450,7 @@ void WindowManager::SetResizable(const flutter::EncodableMap &args)
     DWORD gwlStyle = GetWindowLong(hWnd, GWL_STYLE);
     gwlStyle = isResizable ? gwlStyle | WS_THICKFRAME : gwlStyle & ~WS_THICKFRAME;
     SetWindowLong(hWnd, GWL_STYLE, gwlStyle);
+	SetWindowPos(hWnd, nullptr, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE | SWP_DRAWFRAME);
 }
 
 bool WindowManager::IsMinimizable()

windows/window_manager_plugin.cpp

@@ -105,13 +105,15 @@ std::optional<LRESULT> WindowManagerPlugin::HandleWindowProc(HWND hWnd, UINT mes
             GetWindowPlacement(hWnd, &wPos);
             RECT borderThickness;
             SetRectEmpty(&borderThickness);
-            AdjustWindowRectEx(&borderThickness, GetWindowLongPtr(hWnd, GWL_STYLE) & ~WS_CAPTION, FALSE, NULL);
+            AdjustWindowRectEx(&borderThickness, GetWindowLongPtr(hWnd, GWL_STYLE) & ~WS_CAPTION & WS_BORDER, FALSE, NULL);
             NCCALCSIZE_PARAMS *sz = reinterpret_cast<NCCALCSIZE_PARAMS *>(lParam);
+			
+			bool isResizable = window_manager->IsResizable();
             // Add 1 pixel to the top border to make the window resizable from the top border
-            sz->rgrc[0].top += 1;
-            sz->rgrc[0].right -= borderThickness.right;
-            sz->rgrc[0].bottom -= borderThickness.bottom;
-            sz->rgrc[0].left -= borderThickness.left;
+            sz->rgrc[0].top += isResizable ? 1 : 0;
+            sz->rgrc[0].right -= isResizable ? 7 : 0;
+            sz->rgrc[0].bottom -= isResizable ? 7 : 0;
+            sz->rgrc[0].left += isResizable ? 7 : 0;
 
             return (WVR_HREDRAW | WVR_VREDRAW);
         }