Update hint text

lib/l10n/intl_en.arb

@@ -110,5 +110,6 @@
   "updateRequest": "Please try to use the latest version. Visit the project address to check for the latest version.",
   "avncScreenResize": "Adaptive Screen Size",
   "avncResizeFactor": "Screen Scaling Ratio", 
-  "avncResizeFactorValue": "Current scaling is"
+  "avncResizeFactorValue": "Current scaling is",
+  "recommendHidpi": "Recommended to enable HiDPI Support simultaneously"
 }

lib/l10n/intl_zh.arb

@@ -110,5 +110,6 @@
   "updateRequest": "请尽量使用最新版本。前往项目地址可查看最新版本。",
   "avncScreenResize": "自适应屏幕尺寸",
   "avncResizeFactor": "屏幕缩放比",
-  "avncResizeFactorValue": "当前缩放为"
+  "avncResizeFactorValue": "当前缩放为",
+  "recommendHidpi": "推荐同步开启高分辨率支持"
 }

lib/l10n/intl_zh_Hant.arb

@@ -110,5 +110,6 @@
   "updateRequest": "請盡量使用最新版本。前往專案網址查看最新版本。",
   "avncScreenResize": "自適應螢幕尺寸",
   "avncResizeFactor": "螢幕縮放比",
-  "avncResizeFactorValue": "目前縮放為"
+  "avncResizeFactorValue": "目前縮放為",
+  "recommendHidpi": "推薦同步開啟高解析度支援"
 }

lib/main.dart

@@ -463,6 +463,12 @@ sed -i -E "s@^(VNC_RESOLUTION)=.*@\\1=${w}x${h}@" \$(command -v startvnc)""");
             if (!value && Util.getGlobal("dri3")) {
               G.prefs.setBool("dri3", false);
             }
+            if (value) {
+              ScaffoldMessenger.of(context).hideCurrentSnackBar();
+              ScaffoldMessenger.of(context).showSnackBar(
+                SnackBar(content: Text(AppLocalizations.of(context)!.recommendHidpi))
+              );
+            }
             setState(() {});
           },),
           const SizedBox.square(dimension: 16),