[BUG]快捷页面搜索栏残留

在使用过程中偶尔发现快捷页面的搜索栏不收回去，半透明地挡住其他页面。（详见附件截图）
重启浏览器可恢复。有劳修复。


系统信息：
Version: 5.1.1.200
OS: 6.1.7601.Service Pack 1
IE: 11.0.9600.18762

Maxthon.exe = 5.1.1.200
MxBrowser.dll = 2.0.2.223
mx_core.dll = 4.1.16.465
Maxzlib.dll = 2.2.3.10
MxService.dll = 1.0.90.498
MxAddonsMgr.dll = 5.3.0.12
MxCrashCatch.dll = 4.0.1.18
MxDb.dll = 5.37.19.8
MxDownloader.dll = 5.1.0.113
MxEncode.dll = 2.0.0.10
MxFilePackage.dll = 2.0.3.6
MxHttpRq.dll = 4.0.0.60
MxIPC.dll = 4.3.0.10
MxMsg.dll = 2.0.0.24
MxResMgr.dll = 5.2.8.208
MxRsc.dll = 5.0.0.26
MxTool.dll = 2.2.0.85
MxUI.dll = 3.3.3.154
MxXDR.dll = 2.1.0.8
MxCmpUrl.dll = 5.0.0.12
MxFav.dll = 4.0.0.20
MxFavDb.dll = 13.0.0.12
MxHistory.dll = 2.5.0.6
MxQRGen.dll = 2.1.0.6
MxSiteIcon.dll = 2.0.18.38
MxSmartUrl.dll = 3.0.0.44
MxStorage.dll = 2.0.6.22
MxMolebox.dll = 1.2.3.195
MxSync.dll = 3.0.2.28
MxUrlSec.dll = 3.0.0.40
MxAvatarExt.dll = 5.1.0.8
MxExtTools.dll = 4.0.0.22
MxAddonMisc.dll = 5.2.0.50
MxMsgCenter.dll = 1.0.0.6
MxMsgPush.dll = 3.0.0.52
MxQrcLogin.dll = 1.0.0.8
MxSvInfo.dll = 3.2.0.20
MxUeip.dll = 3.0.1.44

一直就有这个问题，只不过是复现几率非常低，我们正在找寻复现几率高的步骤