[FEATURE] Re-render Only When Variable Changes

[harshkhandeparkar]

Description of the requested feature

Using Hyprland's damage blink debug option, it can be seen that widgets re-render even if the variables used in them do not change. The re-render is triggered whenever a poll variable polls, even if its value remains the same as the previous.

It would be good to re-render widgets only if the new value of a variable is different from the previous to save resources.

Proposed configuration syntax

No response

Additional context

No response

[harshkhandeparkar]

I want to work on this issue. Is it as simple as adding an if condition on this line or something deeper needs to be taken care of or is there a better way to implement this? @elkowar

My proposed solution:

        if let Some(entry) = self.graph.scope_at_mut(scope_index).and_then(|scope| scope.data.get_mut(updated_var)) {
            if *entry != new_value {
                *entry = new_value;
                self.notify_value_changed(scope_index, updated_var)?;
            }
        }

I tested this on my system (although with only a few widgets, not extensively), and it seemed to work.