Previously, we automatically exited URL mode whenever we received data
on the PTY. This was done since we don’t know _what_ has changed on
the screen, and we don’t want to display misleading jump labels.
However, this becomes a problem in curses-like applications that
periodically updates part of the screen. For example, a statusbar with
a clock.
This patch changes this behavior; instead of cancelling URL mode when
receiving PTY data, we snapshot the grid when entering URL mode.
When *rendering*, we use the snapshot:ed grid, while PTY updates
modify the “real” grid.
Snapshot:ing the grid means taking a full/deep copy of the current
grid, including sixel images etc.
Finally, it isn’t necessary to “damage” the entire view
when *entering* URL mode, since we’re at that point the renderer is in
sync with the grid. But we *do* need to damage the entire view when
exiting URL mode, since the grid changes on the “real” grid hasn’t
been tracked by the renderer.
Which means, when we match URI start and end points against the
current column index, we must *not* use ‘if...else if’, but two
‘if... if’.
Fixes an assertion when resizing a window with an URI range of just
one cell.
Allow the caller to pass the same FD (for example, a single /dev/null
FD) to spawn().
All we need to do to handle this correctly is ensure we don’t try to
close the same FD multiple times.
When disabled (the default), the cursor is positioned on a new line
after emitting a sixel image.
When enabled, the cursor is positioned to the right of the sixel
image.
Closes#363
When enabled (the default), sixels use private color registers. That
is, the color palette from the last sixel is *not* re-used.
When disabled, sixels share (i.e. re-use) the same color palette.
Closes#362
* 8-bit control characters are virtually never used. Many terminals do
not support them. As such, there is no need to draw attention to the
fact that foot does not implement them.
* Rename the “CC0 - 7-bit control characters” section to “Control
characters”.
