2. press CTRL+Q - turn on "Quick View"
3. press ALT+TAB to switch to another application e.g. another instance of TC (or use Windows taskbar)
4. press ALT+TAB to switch back to TC with QUick View enabled.
Panel title bar indicates that file panel is active while cursor on file changed to inactive one and "space" switch to next file (if lister plugin support this hotkey) although cursor on file don't change position.
Now repeat procedure with file panel on right and Quick View on left - no bug!
This same of course for top (=left) and bottom (=right)
TC 9.20 and 9.21 RC1 x32 & x64 versions
Windows 10 x64 Home (17134.165)
EDIT
To moderators - this should be posted in "TC9.2x bug reports (English)" forum of course - I don't know how this happened
