Use TextActor3D for CubeAxes representation

The titles and labels are smoother with UseTextActors3D

Change-Id: I310ebcbe1d798d95e141dd8e608b4de39699bd18
Restore scalar bar widget position and size.

Change-Id: I73513bc0cf8b5c12bf4f2ae4c09199f3dddc6b95
Merge topic 'scalarbar-remove-useless-borders' into next

9c7f284 Restore scalar bar widget position and size.
Move VTK even further to have the leak fix.

Change-Id: I2b4c3b7f1887a17feabc0bf0a46f8b3c024593db
Merge topic 'smooth-cube-axis-actor-labels' into next

d46a312 Move VTK even further to have the leak fix.
6e2a61b Use TextActor3D for CubeAxes representation
Only store modified properties to python state files

This updates the python state file code to only store properties
which have modified values. This reduces the clutter in python
state files.

Change-Id: Ie1a7115771f79b1b7f30bd9e21bd39a66bae5d75
BUG #14158: Update threshold panel to use double-ended slider.

Updating Threshold panel (i.e. pqDoubleRangeSliderPropertyWidget) to use double ended
slider instead of two separate sliders. This overcomes wierd sync and update issues
that were common with Threshold panel esp. on Macs.

Change-Id: I2afad95c7d582a547c03974da9830554fe320f7c
Merge topic '14158_update_threshold_panel' into next

8107ac4 BUG #14158: Update threshold panel to use double-ended slider.
Merge topic 'only-store-modified-properties' into next

9c46abb Only store modified properties to python state files
Properly handle broken pipe

In case of server side disconnection (crash/timeout/...),
ParaView now properly notify the user and provide a possibility to
save the current state to the disk.

Change-Id: I0555b45ef1624f1e157ddad922eb84d48eb96d2c
Add PARAVIEW label to SavePythonState test

Change-Id: I14c0538fc460ded1ce410df78f1fee64f62bbec3
Merge topic 'only-store-modified-properties' into next

0eb081c Add PARAVIEW label to SavePythonState test
Merge topic 'better_disconnect_error' into next

841f115 Properly handle broken pipe
Add missing include for signals

Change-Id: Ie5776f45845611c529827c81b05a875684a9141e
Merge topic 'better_disconnect_error' into next

d82cf1c Add missing include for signals