fix double click cannot switch to dialog

Author: zerobikappa

plugindevtools/PluginDevTools/PluginDevToolsDocker.py

@@ -10,13 +10,18 @@ class PluginDevToolsDocker(DockWidget):
     def __init__(self):
         super().__init__()
         self.setWindowTitle(DOCKER_TITLE)
+        self.titleBarEventListening = False
 
     def canvasChanged(self, canvas):
         pass
 
     def showEvent(self, event: QtGui.QShowEvent) -> None:
         #print('PluginDevToolsDocker showEvent')
         #print('    sender= ', self.sender())
+        if self.titleBarEventListening == False:
+            if isinstance(self.titleBarWidget(), QWidget):
+                self.titleBarWidget().installEventFilter(self)
+
         if isinstance(self.sender(), QAction):
             self.signal_manualOpenDocker.emit()
             return super().showEvent(event)
@@ -33,3 +38,11 @@ def showEvent(self, event: QtGui.QShowEvent) -> None:
         return super().showEvent(event)
 
 
+    def eventFilter(self, obj: QObject, event: QEvent) -> bool:
+        if obj is self.titleBarWidget():
+            if event.type() == QEvent.Type.MouseButtonDblClick:
+                if not self.isFloating():
+                    self.signal_leaveFloating.emit()
+                    return True
+        return super().eventFilter(obj, event)
+