A Time Saving Opinion - GUI126
Some widgets indeed take very long to build. Some of such widgets are used in many programs. So to cut time thereby cutting costs we should reuse some of these widgets by calling them from a separate executable ( or program).
You must note this doesn't work in all cases.
A list of such widgets I have noticed over the years (I’m not old) that fits to this approach are:
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File pickers
Google search for some these
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Color Picker
Try this one Pickers from sae.ng
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Text Picker
Especially one with grammar checks and spell check
Try this one Pickers from sae.ng
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Viewers of known common formats like PDF
xdg-open command can help on Ubuntu