Normally we don't dirty the cell on cursor movement. But, since a
blinking cursor isn't a cursor that has moved, our normal cursor
rendering wont work.
Dirty the cursor cell to force a redraw of it.
Blinking can be enabled either by setting the cursor style with
CSI Ps SP q
and selecting a blinking style.
Or, with 'CSI ? 12 h'
Note that both affect the same internal state. I.e. you can disable
blinking with CSI ? 12l after having selected a blinking cursor
style. This is consistent with XTerm behavior.
This behavior is debatable, but helps in error handling where we're
removing a bunch of descriptors where not all of them have been added
to the FDM yet.
Instead of first memmoving, possibly lots of data lots of times, the
received buffer, and _then_ calling the callback, simply call the
callback multiple times, and just skip the \r character(s).
XTerm seems to ignore these when in UTF-8 mode. Since we _only_
support UTF-8, we don't need to recognize these control characters at
all.
However, it may be good to have them here for reference. So add them,
but commented out, along with their corresponding 7-bit
versions (which we _do_ recognize and implement).
When splitting the font configuration into multiple font
specifications, we now trim leading spaces.
This makes no actual difference; fontconfig matched the fonts just
fine anyway, but this looks better in the logs.
In most cases (i.e. when there's only a single output/monitor), this
will be *the* DPI value.
In other cases, well...
The _right_ thing to do is track the outputs our window is actually
mapped on, and re-instantiate fonts depending on the current output's
DPI. But that's for the future...
When we calculate the end coords, we must reset end-col when we reach
the end of the line and bump the end-row.
This fixes an issue where bumping the row once lead to the end row
being bumped for *each* remaining match character.
This shouldn't be necessary, but Sway acts up when the subsurface
exceeds the parent surface (window, in this case) size, and extends
the window size (if floating), leaving it with no content
