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Prior to this change, the UI thread was consuming approx. 10-14% CPU
in the idle state, and appeared to be running in an endless loop.
After this change, the UI thread is measured at about 0.1% CPU. I'm
not sure what the current consumption impact is, but it's gotta be
a power saving, even if slim?
Following manual testing with the device after flashing this change,
the UI responsiveness and music playback does not appear to be
negatively affected. The UI actions that were tested were:
- Scrolling through items on the root menu
- Scrolling through settings
- Scrolling through All Tracks with long-press on the bottom of
the scroll wheel (Page Down) on a device with ~20k songs
- Repeatedly hitting 'next track'
- Forcing a DB update, and scrolling through All Tracks while
updating the database.
The device was configured with the following settings when tested:
- TTS enabled
- Wired headphones
- Bluetooth enabled but not connected
- No DB auto-update
- Playing music
Prior to this change, the UI thread was consuming approx. 10-14% CPU
in the idle state, and appeared to be running in an endless loop.
On a stock (v1.2.2) build, `tasks` reported:
```
→ tasks
name core free stack run time
IDLE1 1 1.0 KiB 99.6%
IDLE0 0 1.1 KiB 86.5%
ui any 10.1 KiB 13.7%
console_repl 1 5.6 KiB 0.5%
Tmr Svc any 1.4 KiB 0.0%
audio_dec any 19.4 KiB 0.0%
main 0 2.0 KiB 0.0%
lvglDraw any 2.9 KiB 0.0%
btController 0 2.1 KiB 0.0%
esp_timer 0 3.4 KiB 0.0%
BTC_TASK 1 2.6 KiB 0.0%
worker_1 any 30.1 KiB 0.0%
worker_3 any 5.7 KiB 0.0%
worker_2 any 29.5 KiB 0.0%
worker_0 any 25.7 KiB 0.0%
BTU_TASK 1 3.2 KiB 0.0%
hciT 1 1.5 KiB 0.0%
ipc0 0 1.0 KiB 0.0%
ipc1 1 1.0 KiB 0.0%
audio_conv any 3.4 KiB 0.0%
```
Following this change, the UI thread decreased from 13% in idle to
0.1% usage, as reported by `tasks`:
```
→ tasks
name core free stack run time
IDLE1 1 1.0 KiB 99.8%
IDLE0 0 1.1 KiB 99.4%
console_repl any 6.4 KiB 0.5%
ui any 10.1 KiB 0.1%
btController 0 2.1 KiB 0.0%
Tmr Svc any 1.4 KiB 0.0%
esp_timer 0 3.4 KiB 0.0%
audio_dec any 19.4 KiB 0.0%
ipc1 1 1.0 KiB 0.0%
ipc0 0 1.0 KiB 0.0%
hciT 1 1.5 KiB 0.0%
BTU_TASK 1 3.2 KiB 0.0%
worker_3 any 20.7 KiB 0.0%
worker_2 any 29.4 KiB 0.0%
BTC_TASK 1 2.5 KiB 0.0%
worker_1 any 30.1 KiB 0.0%
worker_0 any 5.7 KiB 0.0%
lvglDraw any 2.9 KiB 0.0%
main 0 2.0 KiB 0.0%
audio_conv any 3.4 KiB 0.0%
```
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