PrintRegValue returned "N/A" for the VFPU category, and CtrlRegisterList
had its WM_VSCROLL case commented out, so only the rows that fit in the
window were reachable - about a quarter of the 128 VFPU registers. Print
the float the same way the FPU tab does, give the list a real scrollbar
with mouse wheel support, keep the keyboard selection in view, and reset
the position when switching tabs.
The category header hit test now uses the client rect so the tab
boundaries match what's drawn once the scrollbar takes its share of the
width. KernelThreadDebugInterface gets the same one-line fix for parity.
Artem Lytkin
dcf442349f