ncsixel_as_rgba: incorrect state is set following '-'

[waveplate]

oi, there seems to be another bug in ncsixel_as_rgba !

      }else if(*sx == '$'){
        x = 0;
        state = STATE_WANT_DATA;
      }else if(*sx == '-'){
        x = 0;
        y += 6;
        state = STATE_WANT_HASH;
      }else{

setting the state to STATE_WANT_DATA after the - command fixed it for me

or more concisely, since the state is already STATE_WANT_DATA at this point

      }else if(*sx == '$'){
        x = 0;
      }else if(*sx == '-'){
        x = 0;
        y += 6;
      }else{

the following sixel images will trigger the bug:

laughing.txt
red40.txt

been using notcurses for a little while now -- really great project :)

[dankamongmen]

good find! as you can see, this code has not been heavily used nor properly tested =].

i'm glad to hear you're liking the project. i'm hoping to do a release very soon that will wrap up these fixes.

[dankamongmen]

process_escape:2219:walk result on 99 (c): 1 386
handoff_initial_responses_late:1198:handing off initial responses
block_on_input:2457:blocking on input availability
block_on_input:2514:waiting on 1 fds (ibuf: 0/8192)
ncplane_new_internal:692:created new 64x132 plane "std" @ 0x0
ncsixel_as_rgba:172:invalid rle 1 + 1 > 1
ncvisual_from_sixel:809:failed converting sixel to rgba
===============================================================================
/home/dank/src/dankamongmen/notcurses/src/tests/sixels.cpp:17:
TEST CASE:  Sixels
  LoadBiggerSixel

/home/dank/src/dankamongmen/notcurses/src/tests/sixels.cpp:46: FATAL ERROR: REQUIRE( ncv ) is NOT correct!
  values: REQUIRE( nullptr )

===============================================================================
[doctest] test cases:  1 |  0 passed | 1 failed | 45 skipped
[doctest] assertions: 18 | 17 passed | 1 failed |
[doctest] Status: FAILURE!
[schwarzgerat](1) $ 

i'm reproducing this in unit tests now.

[dankamongmen]

Closed by #2788. Thanks a bunch, @waveplate !