xterm ncplayer -k suffers fullscreen bouncing when used with non-pixel blitters

[dankamongmen]

See #1804 for background. It looks like ncplayer -k with XTerm causes bounces unless -bpixel is used.

[dankamongmen]

just about fixed. only problem now would seem to be that in all terminals, -k with a non-fullescreen video runs up to the top of the screen. this only happens with video, so it's presumably something in ncdirect_stream().

[dankamongmen]

this last was apparently also happening with 2.3.5 [shrug] [sigh].

[dankamongmen]

and 2.3.4. this has been happening for some time.

[dankamongmen]

is it possible this has never worked? surely not, right? i've tested this, i'm pretty certain.

[dankamongmen]

i guess i've never tested it from anywhere but the top? maybe? i don't think so, though...

[dankamongmen]

want to move the cursor up one less now that we stay on the same row where we printed, unless we filled the row, in which case we move it up the full expected amount (and the left not at all).

[dankamongmen]

i think i've got a good fix

[dankamongmen]

except #1747 is fucking us on alacritty, goddamnit why must everything be so difficult

[dankamongmen]

this works now everywhere i can test, in all configurations i've tested, except alacritty (see #1747).