More visibly show Power Saver is enabled on top bar
It would be nice to more visibly surface when Power Saver is enabled, e.g. with a distinct battery icon or by adding the existing power saver icon next to the battery.
In this vein, @wjt shared an interesting anecdote today:
Well, I've remembered why my laptop has been running so painfully slowly: I set the power profile in the system menu to Power Saver two days ago when my battery was running low
Better surfacing when Power Saver is enabled could prevent folks from having a bad experience without realizing why. Most other OSes seem to do this.
Something to consider is whether this should only affect Power Saver, or the Performance mode as well, for the opposite concern: e.g. someone may want to know why their battery is draining faster.
Prior art
Windows
Windows uses a leaf to represent their "Battery saver" mode. This icon is in the quick settings and overlaid in green on the battery in the taskbar when enabled.
Android
Android (at least Android 14, on Pixel) uses a battery with a + sign in it to represent their "Battery Saver" mode in quick settings. When it is enabled, the battery icon in the top bar is recolored yellow, and has an overlaid + to make it more visibly obvious (I don't love the low contrast here when it's enabled with a full battery, but I digress:
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When first introduced all the way back in Android 5, they went much further and colored the entire top and bottom bars bright orange when battery saver was enabled: