Fixes #1724: WIDGET_SLIDER with TITLE crashes when setting value

[frankmri]

No description provided.

[frankmri]

Hi, this may not be the right way to fix this, in this case just use it as a pointer to the culprit, best, Frank.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (8157c12) 42.06% compared to head (94b2bab) 42.05%.

Files	Patch %	Lines
src/gdlwidget.cpp	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1729      +/-   ##
==========================================
- Coverage   42.06%   42.05%   -0.01%     
==========================================
  Files         361      361              
  Lines       96391    96399       +8     
  Branches    19802    19805       +3     
==========================================
  Hits        40543    40543              
- Misses      55848    55856       +8     

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[GillesDuvert]

Thanks @frankmri Will merge this hopefully soon now.
Congrats, this was not easy... We do not have so many contributors, especially handy with wxWidgets... 😄 .. and C++ ... 😄 ... Thanks again.

[frankmri]

Thank you @GillesDuvert for including this!
Best