Widgets with a flashing cursor should turn them off when not on current screen

[davep]

Using this code:

from textual.app import App, ComposeResult
from textual.widgets import Input

class DoubleCursorApp(App[None]):

    def compose(self) -> ComposeResult:
        yield Input()

if __name__ == "__main__":
    DoubleCursorApp().run()

if you pull up the command palette you end up with two flashing cursors:

Screen.Recording.2023-09-26.at.11.41.36.mov

We should probably have Input (and likely TextArea) not show the visible state of the cursor if the app's current screen isn't the widget's screen.

[willmcgugan]

I wonder if we should effectively blur everything on the non-active screen.

Alternatively, maybe a timer could have a "pause if not in active screen" setting.

[davep]

I wonder if we should effectively blur everything on the non-active screen.

That would potentially be an issue for the command palette as knowing the focused widget below is helpful; also I feel that dimmed focused state makes sense for the background widget. I think pausing the timer does make more sense.