Fix interval select window

The interval select window did not work, especially the slider. The slider has been entirely changed, now it works. Some refacto was also done.

added 1 commit

• 208d005d - Refacto interval select

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added 1 commit

• 7ec054cf - Refacto interval select

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resolved all threads

• Try to minimize new code smells
• add a comment describing the purpose of RangeSlider class
• maybe add a suffix to the RangeSlider class name to make it explicit it is a (custom) widget

requested changes

added 6 commits

• 251e8b2e - Add RangeSliderWidget files
• 96706dd9 - Change qxtspanslider to RangeSlider
• 063dad37 - Fix render/slider not updatind when slider/render was changed
• af6bb8b8 - Fix render flickering when moving slider
• 9e5fa9be - Remove Ok and Cancel button, Add Close button
• d27b6a00 - Refacto interval select

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resolved all threads

approved this merge request

added 12 commits

• d27b6a00...fd98c577 - 6 commits from branch solverstack:master
• 368d2d87 - Add RangeSliderWidget files
• d53e79d2 - Change qxtspanslider to RangeSlider
• 04a21e23 - Fix render/slider not updatind when slider/render was changed
• 3c05ed92 - Fix render flickering when moving slider
• 01afed98 - Remove Ok and Cancel button, Add Close button
• e5f5324e - Refacto interval select

Compare with previous version