[Bug] Recomputing causes mouse-button to get locked

[Glitchy-Tozier]

Is there an existing issue for this?

• I have searched the existing issues

Forums discussion

https://forum.freecadweb.org/viewtopic.php?f=3&t=72947

Version

0.20 (Release)

Full version info

OS: KDE Flatpak runtime (X-Cinnamon/cinnamon)
Word size of FreeCAD: 64-bit
Version: 0.20.1.29410 (Git)
Build type: Release
Branch: (HEAD detached at 0.20.1)
Hash: f5d13554ecc7a456fb6e970568ae5c74ba727563
Python 3.9.9, Qt 5.15.5, Coin 4.0.0, Vtk 8.2.0, OCC 7.6.2
Locale: English/United Kingdom (en_GB)

Subproject(s) affected?

No response

Issue description

Steps to Reproduce

1. Open attached file
2. Use Blender-Navigation (it might happen with others, too)
3. Navigate to Combo-view -> Tree-view (=Model-tab)
4. Click on KeyNrDependentObjects
5. In that std_part's Property Editor, inside the Data-tab, scroll all the way down until you find Config -> KeyNumber
6. Change KeyNumber via the dropdown-menu
7. Hover over the 3D-view and click on (and immediately release) the middle mouse-button to start rotating the screen
8. See bug: Once recomputing has finished, you will locked inside the rotation-action

Anything else?

Not sure what to put into the "Subproject(s) affected?"-field. I've left it at "None"

Code of Conduct

• I agree to follow this project's Code of Conduct

[luzpaz]

Confirmed on the forum thread

[luzpaz]

@wwmayer reproduces the issue with a simplified example (in the thread)

import time
from PySide2 import QtCore

class Feature:
  def __init__(self, fp):
    fp.Proxy = self
  def execute(self, fp):
    time.sleep(1.0)
    print ("Execute")
    QtCore.QCoreApplication.processEvents()


doc = App.newDocument()
obj = doc.addObject("App::FeaturePython", "Feature")
obj.addProperty("App::PropertyFloat", "Number")
Feature(obj)
doc.recompute()

Now select Feature, change its Number property and middle-click inside the 3D view. The problem is caused by the function call QtCore.QCoreApplication.processEvents() that causes the system not to send the mouse release event to the navigation style.