Previewer: Gesture navigation overrides interacting with the Slider

[david-allison]

Anki-Android/AnkiDroid/src/main/res/layout/previewer.xml

Lines 53 to 66 in 2c29b47

	<com.google.android.material.slider.Slider
	android:id="@+id/slider"
	android:layout_width="0dp"
	android:layout_height="wrap_content"
	app:layout_constraintStart_toStartOf="parent"
	app:layout_constraintEnd_toEndOf="parent"
	app:layout_constraintTop_toBottomOf="@id/webview_container"
	android:valueFrom="1"
	android:stepSize="1"
	tools:value="421"
	tools:valueTo="732"
	style="@style/SliderStyle"
	/>

When the slider is in active use, gesture navigation from the edges over the slider control should be disabled, otherwise this makes it difficult to begin using the slider.

[adi09871]

Root Cause: System edge-to-edge gesture navigation intercepts touch events at the screen edges, overriding the Slider's default onTouch handling.

Fix: Invoked slider.parent.requestDisallowInterceptTouchEvent(true) inside onStartTrackingTouch to prevent the view hierarchy and OS from hijacking the active swipe gesture. Reverted to false in onStopTrackingTouch to restore normal system navigation.

Testing done. Raising a PR shortly.