Problem was that cfd7648fce2388ec8ae35b38004f2ae111c484af fixed a memory leak
but created a dangling pointer bug, which does not happen during usual run
of Audacity because AudacityProject::OnCloseWindow is reached then before
destroying AudacityProject.
Fixed it by using a std::shared_pointer for the TrackList that both
AudacityProject and TrackPanel must use.
This introduces a new variable, mStopIfWasPaused (default true). Actions which require AudioIONotBusyFlag will now stop the audio, if audio was busy but paused and attempt to continue.
We could perhaps make mStopAudioIfWasPaused into a preference, but I don't think we need to keep even the option of the old behaviour.
1) Enable scrub bar by default, to increase visibility of the new feature.
2) Add 'Enable/Disable Scrub Bar' to QP right click menu.
Did not remove Scrubbing from transport menu, as to do so disables scrubbing.
Vital feature of MixerBoard as the point is to be able to have large sliders.
The problem was that the slider background was cached in a bitmap, and that cached image was not being refreshed on a resize.
Baselines of text produces by ShuttleGuiBase::AddPrompt and ShuttleGuiBase:AddUnits are different.
Simple fix of changing a style. Presumably this was a typo.
Doing BalanceInfoDel in this delayed fashion will be needed when the other
call to it is eliminated, as shared_ptr simplifies the management of BlockFile
and makes the many calls to Ref and Deref disappear.
The change tempo effect was modified in commit 8e0089c.
The most significant change is to include the "from" length in the accessibility name of the "to" length textctrl. (The nvda screen reader cannot access the value of the "from" length textctrl, and it's not straightforward using Jaws. Note that this issue existed before the recent change of Change Tempo.)
There remains a minor issue of Jaws, but not NVDA reading the names of wxStaticBoxes, and so some repetition in what is read by Jaws.
