QColorDialog关闭后，PyQt5主窗口将关闭

Question

此小应用程序在关闭或最小化后将隐藏在托盘中。我想弹出一个QColorDialog来选择一种颜色。这是代码：

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QDesktopWidget, QLineEdit, \
                            QSystemTrayIcon, QMenu, QAction, QTabWidget, QVBoxLayout, \
                            QPushButton, QTableWidget, QHeaderView, QMessageBox, \
                            QGridLayout, QPushButton, QTableWidgetItem, \
                            QAbstractItemView, QHBoxLayout, QLayout
from PyQt5.QtGui import QIcon, QPixmap, QDropEvent
from PyQt5 import QtGui
from PyQt5 import QtWidgets
from PyQt5 import QtCore



class App(QWidget):

    def __init__(self):
        super().__init__()
        self.left = 10
        self.top = 10
        self.width = 460
        self.height = 360
        self.initUI()
        # create tray icon 
        self.initTrayIcon()
        # create tab1,  parent is APP
        self.initTab1()    
        self.initTab2()  
        self.initTab()


    def initUI(self):
        self.setFixedSize(self.width, self.height)
        self.setWindowFlags(QtCore.Qt.Tool | QtCore.Qt.FramelessWindowHint)
        self.setWindowOpacity(0.95)
        ag = QDesktopWidget().availableGeometry()   
        self.fixedGeometry = (ag.width() - self.width - 20, 
                        ag.height() - self.height - 5, 
                        self.width, 
                        self.height)
        self.setGeometry(*self.fixedGeometry)
        self.show()


    def initTrayIcon(self):
        self.tray_icon = SystemTrayIcon(self)
        self.tray_icon.show()


    def initTab(self):
        # init tab 
        self.layout = QVBoxLayout()
        self.tabs = QTabWidget()       
        self.tabs.resize(458, 358)
        self.tabs.addTab(self.tab1, "T1")
        self.tabs.addTab(self.tab2, 'T2')
        self.bottom = QHBoxLayout()
        self.pinButton = QtWidgets.QPushButton('Color')
        self.pinButton.setMaximumSize(30, 30)
        self.pinButton.clicked.connect(self.winPinTop)
        self.bottom.addWidget(self.pinButton,alignment=QtCore.Qt.AlignRight)
        self.bottom.setContentsMargins(1, 1, 1, 1)

        # add tabs to widget
        self.layout.addWidget(self.tabs)
        self.layout.addLayout(self.bottom)
        self.layout.setContentsMargins(0, 1, 0, 2)
        self.setLayout(self.layout)

    # tab1 
    def initTab1(self):
        self.tab1 = QWidget()
        self.tab1.layout = QVBoxLayout()
        lb = QLabel()
        lb.setText('tab1')
        self.tab1.layout.addWidget(lb)
        self.tab1.setLayout(self.tab1.layout)


    # tab2 
    def initTab2(self):
        self.tab2 = QWidget()
        self.tab2.layout = QVBoxLayout()
        lb = QLabel()
        lb.setText('tab2')
        self.tab2.layout.addWidget(lb)
        self.tab2.setLayout(self.tab2.layout)

    # hide to system tray instead of close
    def closeEvent(self, event):
        print('APP close')
        event.ignore()
        self.hide()

    # display window in the right bottom
    def rightBottomShow(self):
        self.setGeometry(*self.fixedGeometry)
        self.show()


    def winPinTop(self):
        color_dialog = QtWidgets.QColorDialog()
        color_dialog.setOption(QtWidgets.QColorDialog.DontUseNativeDialog)
        color = color_dialog.getColor()
        if color.isValid():
            print(color.name())


    def showMenu(self):
        print('menu')


class SystemTrayIcon(QSystemTrayIcon):
    def __init__(self, parent=None):
        super(SystemTrayIcon, self).__init__(parent)
        icon = QIcon("icons/icon1.png")
        QSystemTrayIcon.__init__(self, icon, parent)

        menu = QMenu(parent)
        showAction = menu.addAction('Show')
        showAction.triggered.connect(self.parent().rightBottomShow)
        menu.addSeparator()
        exitAction = menu.addAction('Exit')
        exitAction.triggered.connect(self.exit)      
        self.setContextMenu(menu)
        self.activated.connect(self.onTrayIconActivated)


    def exit(self):
        QtCore.QCoreApplication.exit()        


    def onTrayIconActivated(self, reason):
        #print(reason, '--reason--')
        if reason == QSystemTrayIcon.Trigger:
            #print(self.parent.frameGeometry(), self.parent.normalGeometry(), ag, sg)
            if self.parent().isHidden():
                self.parent().rightBottomShow()
            else:
                self.parent().hide()



if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

在QColorDialog中单击“取消”或“选择”按钮后，整个应用程序将关闭，没有任何错误。该代码在Ubuntu 19.04中运行。

我的代码中应该有一些错误。

更新2019-9-25

我发现了为什么会这样，这全都与我设置的 WindowFlags 有关。删除QtCore.Qt.Tool标志后，它可以正常工作。也许QColorDialog具有相同的窗口标志？但是我想从任务栏隐藏窗口。