tui.c: Send fewer cursor-hide commands to the terminal.

Since #2158 all connected UIs are informed about the busy state of nvim.
This can be used to decide whether to hide or show the cursor (in one
place).

In the TUI, this is tui_flush(). To prevent cursor flashing, the
terminal is always redrawn with an invisible cursor. After that the
cursor is shown if necessary. In the current implementation
a cursor-hide command will always be the first command in the next
redraw, to prevent flashing. This is not necessary.

Instead we start the TUI with a hidden cursor and only need to hide the
cursor in the next redraw, if the cursor was shown in the last redraw.
Otherwise the cursor is still hidden.

So instead of sending every redraw the cursor-hide command, we only need
to send the command while not busy(a state in nvim with low frequency).

0 files changed, 0 insertions, 0 deletions