It is web-based implementation class for TControlBar
Should be used like TWebCanvas for TCanvas

It should match function name inside

Last Option_t* was missing

Not base TGuiFactory able to create canvas and browser via plugin
handler. No any special graphics library are required for that

Allows to create web-based canvas from regular TGuiFactory
So also in batch mode one should be able to start web-based widgets

There is fictional TVirtualTreeViewer class and RTreeViewer plugin
is activated when web display is configured.

Allows to use web-based canvas and tree viewer together
like in tutorials/tree/tree0.C example

Remove `REve` prefix, adjust all places where used.
Composite shape should be implemented

On some platform operator delete taints the memory, so even right after the deletion the information
stored by ~TObject is already erased.  On those platform we no longer rely on the kNotDelete bit hack
and rely on the system (which has tainted the memory assumingly for a reason) to detect the
use-after-delete problems.

Introduce 2 new functions.

TObject::IsDestructed (used by TClonesArray) that detects that the destructor has been run and is
active in all configuration.  This should be used if the code knows that the memory has not been
freed/deleted.

ROOT::Detail::HasBeenDeleted(TObject*) with returns true if the platform does not taint the memory
and if the kNotDeleted is not set (in all other case, it returns false)

This fixes #11330

The first implementation of RooFitH3 had a number of shortcomings, which this
PR addresses.

In detail:

  * It is now possible to read JSON files independent of the ordering
  * A priority mechanism has been implemented for importers and exporters
  * Duplicate and dead code has been removed
  * Many small bugs have been fixed
  * The JSONInterface has been made public and moved from Detail to
    Experimental, so users can write their own importers & exporters
  * The two unit tests have been fixed

Co-authored-by: Nicolas Morange <nicolas.morange@cern.ch>
Co-authored-by: Jonas Rembser <jonas.rembser@cern.ch>

* use current Python func names,
* suppress everything from libpython
* current xcb (at least on Ubuntu) goes through `__writev`, be less strict.

Make several global atomic to improve thread safely

Namely: 

* TThread::fgxact
* TSystem::fInsideNotify
* TGClient::fGlobalNeedRedraw atomic

Update the valgrind suppression file accordingly.

Also add test for JSROOTSYS to let use special JSROOT local installation
as it THttpServer does

Referencing notebook version is dangerous, while
it may be changed to JSROOT v6.x and older code will not work

Also update minified file
Discovered with DeepCode

Provide TBrowserImp, register it in plugins
To enable one should add following entry in rootrc file:

    Browser.Name: ROOT::Experimental::RWebBrowserImp

The Jupyter config falls back to the CMAKE_INSTALL_PREFIX/js folder to
find JSROOT if ROOTSYS is not set. This ensures installations in prefix
directories to find the installed JSROOT libraries.

Add jupyter_notebook_config.py to JUPYTER_CONFIG_DIR set in the ROOT
setup script, which allows now to use "jupyter notebook" with the same
capabilities than "root --notebook".

- Add build option `asan` to build with address sanitizer.
- Add a suppression file etc/lsan-root.supp with leak sanitizer suppressions.
- Add a directory core/sanitizer.
  - Add a micro library for configuring asan/lsan in ROOT. It is statically linked
    into all ROOT executables.
  - Create a target ROOT::ROOTStaticSanitizerConfig that exectuables can
    link against. This automatically pulls in the correct linker interface.
    This allows to create own sanitised executables that work with a
    sanitised ROOT.
  - Add a shared version of the config library for all cases where
    the address sanitizer run time is LD_PRELOADed into non-instrumented
    executables.
  - Add a README.md with more details.

Idea to implement only few methods for display of TGeoVolume 

add extra static paths to JSROOT scripts

use such static location of JSROOT scripts

release notes aboud offline usage

Wim says: adding 'shell=True' makes the command run on
/bin/sh and allows you to use shell features (such as expansion and
replacement of variables). But nothing in the command seems to need that
feature, and anyway it's a risky thing to rely on, or what am I missing?

Spawning an intermediate shell makes a mess of the environment when running
under conda on Mac in the non-build environment. Running the normal way as
per the patched line above, and all seems good.