fix(Android): center headerTitleAlign below Android API 29 (#2439)

## Description

This PR intents to fix `headerTitleAlign: 'center'` breaking layout on
android API <= 29.

I found changes added in
#2332,
which fixed a related toolbar problem on android API <= 29, affect the
correct layout of the centered title.

The `EXACTLY`
[MeasureSpec](https://developer.android.com/reference/android/view/View.MeasureSpec)
causes the title not to obtain as much space as it needs. Fortunately
changing the spec to `AT_MOST` in the custom `layoutCallback` fixes the
issue without introducing regression.

I also included a check for the current `softInputMode` to abandon the
action if it is not set to `adjustPan`.

Fixes #2435 

## Changes

- updated `Test2332.tsx` repro
- changed measureSpec used in `layoutCallback`
- added `softInputMode` check

## Screenshots / GIFs

| Before
#2332 |
Before | After |
| --- | --- | --- |
|
![Screenshot_20241024_114026](https://github.com/user-attachments/assets/58cd349c-dd26-47ae-b05e-a391f6573672)
|
![Screenshot_20241024_113943](https://github.com/user-attachments/assets/902fc554-ebfd-4bd3-81a0-c0fc70bd038f)
|
![Screenshot_20241024_113853](https://github.com/user-attachments/assets/b60c0e2f-e3a2-4921-bde9-55750bdb617c)
|

## Test code and steps to reproduce

- use `Test2332.tsx` repro

## Checklist

- [x] Included code example that can be used to test this change
- [x] Ensured that CI passes

android/src/main/java/com/swmansion/rnscreens/CustomToolbar.kt

@@ -3,9 +3,11 @@ package com.swmansion.rnscreens
 import android.annotation.SuppressLint
 import android.content.Context
 import android.os.Build
+import android.view.WindowManager
 import androidx.appcompat.widget.Toolbar
 import com.facebook.react.modules.core.ChoreographerCompat
 import com.facebook.react.modules.core.ReactChoreographer
+import com.facebook.react.uimanager.ThemedReactContext
 
 // This class is used to store config closer to search bar
 @SuppressLint("ViewConstructor") // Only we construct this view, it is never inflated.
@@ -18,17 +20,25 @@ open class CustomToolbar(
         object : ChoreographerCompat.FrameCallback() {
             override fun doFrame(frameTimeNanos: Long) {
                 isLayoutEnqueued = false
+                // The following measure specs are selected to work only with Android APIs <= 29.
+                // See https://github.com/software-mansion/react-native-screens/pull/2439
                 measure(
-                    MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
-                    MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY),
+                    MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST),
+                    MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST),
                 )
                 layout(left, top, right, bottom)
             }
         }
 
     override fun requestLayout() {
         super.requestLayout()
-        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.Q) {
+        val softInputMode =
+            (context as ThemedReactContext)
+                .currentActivity
+                ?.window
+                ?.attributes
+                ?.softInputMode
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.Q && softInputMode == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN) {
             // Below Android API 29, layout is not being requested when subviews are being added to the layout,
             // leading to having their subviews in position 0,0 of the toolbar (as Android don't calculate
             // the position of each subview, even if Yoga has correctly set their width and height).

apps/src/tests/Test2332.tsx

@@ -76,7 +76,7 @@ const DetailsScreen = () => {
 function App() {
   return (
     <NavigationContainer>
-      <Stack.Navigator>
+      <Stack.Navigator screenOptions={{headerTitleAlign: 'center'}}>
         <Stack.Screen name="Home" component={HomeScreen} />
         <Stack.Screen name="Details" component={DetailsScreen} />
       </Stack.Navigator>