Common entry-widget for MainGui and SFCalculatorUI

[jmborr]

References Task 4953 [REFRED] Common entry-widget for MainGui and SFCalculatorUI

Manual test for the reviewer

Before running the manual tests, install the conda environment and install the source in editable mode

> conda env create --solver libmamba --name refred-dev --file ./environment.yml
> conda activate refred-dev
(refred-dev)> pip install -e .

Start RefRed GUI

(refred-dev)> PYTHONPATH=$(pwd):$PYTHONPATH ./scripts/start_refred.py

Or run tests

(refred-dev)> pytest test/unit/RefRed/test_main.py

Check list for the reviewer

• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.35%. Comparing base (afa1750) to head (05a7d19).

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #120      +/-   ##
==========================================
+ Coverage   60.13%   60.35%   +0.21%     
==========================================
  Files         119      120       +1     
  Lines       10124    10157      +33     
==========================================
+ Hits         6088     6130      +42     
+ Misses       4036     4027       -9     

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