[nichind]

…titles

what

• Going back from any settings section with the gesture showed the old section again for one frame.
• Section titles changed only after the back animation had finished.

SVID_20261019_190400_1.mp4

why

• Sections used setTransition(TRANSIT_FRAGMENT_OPEN), which plays fragment Animators. With predictive back (Android 14+), FragmentManager seeks those Animators with setCurrentPlayTime() and calls AnimatorSet.start() when the gesture is committed. That call draws one frame at the start values (alpha 1, scale 1).
• Titles were set in onResume(). The entering page only reaches RESUMED after the transition ends.

fix

• Sections use Fade instead of setTransition(). Transitions are seeked by a different mechanism and don't flash, and the fade still follows the gesture.
• Duration is 100 ms (motionDurationShort2 from the Material theme); the default 300 ms felt slow.
• The fade uses M3 emphasized decelerate easing. After the finger is lifted, androidx.transition finishes the seek with its own fixed spring (STIFFNESS_LOW, about 300 ms) that can't be configured, so the fade is front-loaded to be nearly done before release. The visible page change after a gesture went from about 200 ms to 33–66 ms.
• Transitions aren't saved with fragments, so FragmentLifecycleCallbacks re-applies them to restored fragments. Without this, back after a theme change or rotation had no animation.
• Titles are set in onStart() (BasePreferenceFragment, SourceSettingsFragment, and the changelog, nav config, sources manage and plugins manage fragments), which runs when the transition starts. A cancelled gesture runs the section's onStart() again and restores its title. All title setters moved together; otherwise SourceSettingsFragment would show "Settings" before the source name.

SVID_20261019_211913_1.mp4

test

• compileDebugKotlin passes.
• Tested on Android 15 & 13