[FIX] OWWordCloud: scale visualization

[robertcv]

Issue

Fixes #347

Description of changes

Scale font size in proportion to the window size.

Includes

• Code changes
• Tests
• Documentation

[robertcv]

@ajdapretnar Could you please check if the visualizations looks ok. Perhaps we could find a better scaling factor.

[codecov-io]

Codecov Report

Merging #381 into master will decrease coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #381      +/-   ##
==========================================
- Coverage   85.44%   85.08%   -0.36%     
==========================================
  Files          34       34              
  Lines        1951     1951              
  Branches      344      344              
==========================================
- Hits         1667     1660       -7     
- Misses        243      247       +4     
- Partials       41       44       +3

[ajdapretnar]

I like it. The only thing that could be fixed as well is all the redundant white space around the cloud. I think it is excessive. Can you make it smaller? This way the scaling would look better, too.

[robertcv]

The problem is that it depends on the number of displayed words. Some clouds are smaller some are bigger.

[ajdapretnar]

Hm. I get redundant white space for all corpora... 🤔 It's not such a big deal, but if you have any idea how to get rid of so much white space, it'd be great. If not, I can merge as it is.

[ajdapretnar]

Oh, perhaps this could be a part of this issue as well, since scaling depends on the window size. I don't like the fact that one can shrink the widget all the way to the control area. Perhaps some minimum size is in order here. I'll let you decide on this one. :)