This can now be safely use to avoid overloading the queue.

This speeds up the first step of merging (hadd)

This allow the fast cloning of the first tree in the list when using TTree::MergeTrees (rare)

When fMother is not set, first try to use fParent rather than iterate through
the TTree's list of top level branches

fParent was already set during the usual branch creation (TTree::Branch and friends) but
might still be not set if the user create a hierarchy by hand

... instead of just always ignoring it

apply this:
https://github.com/root-project/root/pull/7193#discussion_r585660675

change test limits taken from:
https://github.com/root-project/root/commit/fe5c74b5ed6045eb72091bad693f7af1fdf2266e

Cloned histogram should not be assign to current directory

Adding them in the MT tutorial list should make them run serially

Fixes issue #7115.

Some characters need to be escaped before using variable names in std::regex
expressions formed in RooFormula::processForumla.

Both [ and ] were already considered; this commit adds { and } to the list.

In such case gPad can be set to nullptr and function fails
Solving https://root-forum.cern.ch/t/43560

This modification was done in the old (legacy) JupyROOT, but not
in the new one that was separated from the new PyROOT.

This fixes the display of JSROOT graphics in SWAN.

* Allow for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Fix geom warnings on windows

* Fix to PR 7165: Remove inline access to static class member

(cherry picked from commit 60890d891df3e18c33d321015966916998680a0b)

* Allow for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Add README file for dynamic switching of system of units between Geant4 units and Root units

* Fix geom warnings on windows

(cherry picked from commit 3d545273d7763e09aa85449ba86be5d2493f7f13)

Avoid misinterpretation of parameter if after SetBinary
SetNull is set. Also check memory allocation.

It does not return size of allocated memory,
therefore just reallocate buffer if maxsize bigger than standard buffer

Fixing problem in #7127 with escape characters

The standard does not require that std::string's default constructor
be noexcept until C++17. For C++14, all reasonably new STL
implementations do add the noexcept specifier anyway, but e.g. STLs
coming with very old gcc versions might not.

Co-authored-by: Jonas Hahnfeld <jonas.hahnfeld@cern.ch>
(cherry picked from commit 842bbf85e0c611e00baf724e2c2c3e233b08ef20)

Co-authored-by: will buttinger <will@cern.ch>

The previous logic assumed that different samples would belong to
files with different names.
This could potentially result in wrong data being silently read in
case subsequent samples had same or fewer entries than the first
sample processed by a given thread.

This fixes #7143.

Co-authored-by: @phi-mah

Introduce yet another layer of abstraction in ROpaqueTaskArena,
a class inheriting from tbb::task_arena that will allow us to keep
tbb hidden from ROOT interfaces while solving the issue of having to
forward-declare tbb::task_arena in an interface-dependent way

    warn when the number of threads set by the user is limited at runtime
    by tbb::global_control.

    Fix for github issue #6363: https://github.com/root-project/root/issues/6363

..for things that were true in TPoolManager but not anymore