[dev] [st] Tip adds non-existing trailing whitespace upon mouse selection + fix

[Rafa Garcia Gallego]

Hi,

Upon selecting text with the mouse, st tip fills the selection
straight from its term matrix and replaces unset glyphs with a
whitespace. This results in some really annoying trailing whitespace
at the end of each line when you paste/pipe the selection. Is there
any reason for this?

The attached patch fixes this behavior.

Cheers,
Rafa.

st-tip-do-not-select-trailing-whitespaces.diff
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