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Yee Cheng Chin aa1c720306 Allows smooth resizing of MacVim's window

Adds a setting that allows for smoothly resizing the window. Previously,
MacVim would only allow resizing in fixed increment of the grid size and
snap to such sizes. This was a little more consistent with how terminals
tend to work, and allows for optimal window sizing, and it was also an
artifact of the old MacVim renderer where it didn't have a stateful
renderer that could repaint the text view.

The snapping could be jarring for users more used to modern text editors
which allow for smoothly resizing of the window though, and it makes
third party tools that could snap macOS windows to the side not work
properly as there's usually a gap near the bottom. With guioption-k,
MacVim already allows for decoupling the window size from the Vim's grid
size anyway, so adding smooth resizing allows to work much better under
those assumptions.

In addition to allowing smooth resizing, this change also makes it so
that the CoreText renderer will fill to the right a little bit when
rendering the rightmost column when MacVim's window size isn't exactly
the Vim grid size. Previously, if a color scheme has NonText color (e.g.
desert), or the user has 'cursorline' set, smooth resize (or in full
screen or guioption-k) would leave a gap to the right, looking a little
ugly. This allows the last column's to fully fill to the right,
resulting in a much more consistent look when resizing the window.

Close #948

2022-09-10 21:52:04 -07:00