Implement Scroll UP (SU) and Scroll Down (SD)
myColorIndex is not initialized, making isIndexed() always return true
Fix EDT violation on onPanelResized() callback
Fix bugs + remove code duplication in scrollArea()
Merge pull request #42 from Plonk42/scroll_up_down

Implement Scroll UP (SU) and Scroll Down (SD)
Merge pull request #41 from Plonk42/bugs_fix

Bugs fix