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Design options (expanded text input field):
Figure 1:
appropriate for macOS and Windows, but triangle becomes too small for thin scrollbars, e.g. for Linux with GTK / Gnome 3
Figure 2:
triangle width not consistent to scrollbar width, scrollbar not docked to text input field
Figure 3:
triangle width not consistent to scrollbar width, asymmetic, scrollbar not docked to text input field (current solution)
Figure 4:
triangle width not consistent to scrollbar width, asymmetic, scrollbar not docked to text input field
Figure 5:
triangle width independent of scrollbar width, appropriate for thick as well as for thin scrollbars (proposed solution)