[1.1.x] Add SCROLL_LONG_FILENAMES to reveal longer filenames #8020
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Based on #7637 by @marcio-ao — this is a longstanding feature request!
See also #8021
This PR follows the scheme of the original, scrolling up to the end of the long filename and stopping. Good enough for most. A circular scrolling option may be added later.
A change was made to tell in-place when the row has changed, using a hash of the short filename.
An option was added to prevent
SDCARD_SORT_ALPHA
from exploding its buffer in response to the increased long filename size.