feat: export(block=True) will block next cell execution until export …

[maartenbreddels]

Description

This allows blocking a call, while still responding to widgets, which is useful for exporting figures, e.g.:

exp_plg = cubeviz.plugins['Export']
slice_plg = cubeviz.plugins['Slice']
# for wave in (6.0, 6.1, 6.2):
for wave in (5.5e-7, 7.0e-7, 1e-6):
    slice_plg.value = wave
    for viewer in exp_plg.viewer.choices:#[1:2]:
        exp_plg.viewer = viewer
        exp_plg.filename = f"export/slice_{wave}_{viewer}.png"
        print("saving to", exp_plg.filename)
        exp_plg.export(overwrite=True)#, block=True)

This requires an optional dependency on jupyter_ui_poll

If block=True is not passed, an error will be shown

[kecnry]

143 and AssertionError: assert 'SpecutilsSpectrumParser' == 'FITSParser' errors are unrelated and should be random, so I'll try rerunning tests to see if we can get them passing.

[codecov]

Codecov Report

❌ Patch coverage is 53.33333% with 70 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.90%. Comparing base (40f6dbc) to head (552d653).
⚠️ Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
jdaviz/async_utils.py	54.65%	39 Missing ⚠️
jdaviz/configs/default/plugins/export/export.py	51.56%	31 Missing ⚠️

❌ Your patch check has failed because the patch coverage (53.33%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3868      +/-   ##
==========================================
- Coverage   88.28%   87.90%   -0.38%     
==========================================
  Files         198      203       +5     
  Lines       27241    27567     +326     
==========================================
+ Hits        24049    24233     +184     
- Misses       3192     3334     +142     

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