[FIX] report comments and OWFile reporting filename

[kernc]

Issue

Fixes #1899

Description of changes

Not sure what the problem was re comments. Removing required=required in HTML now works for me. in OWFile, self.loaded_file is now correctly set when the file is loaded, not when browsed for.

Includes

• Code changes
• Tests
• Documentation

[codecov-io]

Codecov Report

Merging #1956 into master will increase coverage by 19.58%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1956       +/-   ##
===========================================
+ Coverage   69.93%   89.52%   +19.58%     
===========================================
  Files         315       91      -224     
  Lines       53979     9200    -44779     
===========================================
- Hits        37752     8236    -29516     
+ Misses      16227      964    -15263

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[ajdapretnar]

All looks good except for one thing. When I create a report, write some comments and save the report, the final comment isn't saved.
The rest works great.

[kernc]

Need more reproductions steps. Can't seem to replicate. The comment saves, or, if unsaved, asks to be.

[ajdapretnar]

I loaded iris.tab, reported File, reported Distributions, reported Box Plot. Wrote comments in each section and saved the report. Comments in File and Distributions were there upon opening html, while the comment for Box Plot disappeared.

I tested this three times, once also with only two reported widgets and it's the same - the final comment is missing. We can check tomorrow.

[kernc]

I can reproduce the issue on WebEngine.

[kernc]

@ajdapretnar Please try if this now works.