Problem: On Windows, if you set the "length" radio button in the selection bar, then tab round to it, this sets the "end" radio button.
This was caused by commit 7e49dc4.
The fix is to restore the previous code just for Windows.
... whenever they really describe the size of a buffer that fits in memory, or
of a block file (which is never now more than a megabyte and so could be fit in
memory all at once), or a part thereof.
... A non-narrowing conversion out to long long is a necessity, but the
conversions to float and double are simply conveniences.
Conversion from floating is explicit, to avoid unintended consequences with
arithmetic operators, when later sampleCount ceases to be an alias for an
integral type.
Some conversions are not made explicit, where I expect to change the type of
the variable later to have mere size_t width.
It WAS working, just not the way QA wanted, because releasing mouse click when in the ruler and on the first seek continued the seek/scrub cycle. Introduced a 'mInOneShotMode' variable to complete the baroque behaviour in the way that was requested. Also updated tool tip code to reflect the one-shot and non one-shot difference in tooltip and status.
... And in some places where a library uses signed types, assert that
the reported number is not negative.
What led me to this, is that there are many places where a size_t value for
an allocation is the product of a number of channels and some other number.
Caused by optimisation of NumericTextCtrl::ValueToControls(). It now only updates on a change, and because mValueStr was being updated without calling value to controls, the string was not being identified as having changed.
This also makes it clearer in the code when we are dealing with a Toolbar ID (for the scrubbing toolbar) and when we are dealing with a button ID (for enabling/disabling the scrub ruler).
... I believe this list of four places is exhaustive.
There are many, many more safe narrowings that I examined.
This resulted from changing the definition of sampleCount in my builds so that
narrowing conversions failed to compile without some fixes, and I examined and
fixed every place.
The rest of that work is not yet shared.
