Fix coverage of PR "Reorganize demos file"

[mvorisek]

To fix only, not to revert

@ibelar there is something wrong this #1122 merged PR, please look at it

That PR dropped the coverage by more then 50%, see https://codecov.io/gh/atk4/ui/tree/75c4026c5199781fdd0c1ad831264a9b02806632

previous commit: https://codecov.io/github/atk4/ui/commit/804728b0ca9e3e05dcf0166bde9265063ee1b756 is fine, revert is also fine, so definitely the issue is that single PR

(links are from Travis 7.2 tests)

[codecov]

Codecov Report

Merging #1139 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1139   +/-   ##
==========================================
  Coverage      27.32%   27.32%           
  Complexity      2536     2536           
==========================================
  Files            130      130           
  Lines           6225     6225           
==========================================
  Hits            1701     1701           
  Misses          4524     4524           

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[ibelar]

Good catch! Thanks

[mvorisek]

Good catch! Thanks

@ibelar Thanks for the approval and even faster merge :), but changes are needed to fix this. Checks passed as the dropped coverage was not decreased further...