Replace Android-only WindowInsets.isImeVisible with expect/actual for iOS compatibility

app/src/androidMain/kotlin/de/westnordost/streetcomplete/ui/util/IsImeVisible.android.kt

@@ -0,0 +1,10 @@
+package de.westnordost.streetcomplete.ui.util
+
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.isImeVisible
+import androidx.compose.runtime.Composable
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+actual fun isImeVisible(): Boolean = WindowInsets.isImeVisible

app/src/commonMain/kotlin/de/westnordost/streetcomplete/quests/address/AnAddressNumberInput.kt

@@ -1,9 +1,6 @@
 package de.westnordost.streetcomplete.quests.address
 
-import androidx.compose.foundation.layout.ExperimentalLayoutApi
-import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.isImeVisible
 import androidx.compose.foundation.text.BasicText
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.foundation.text.TextAutoSize
@@ -21,6 +18,7 @@ import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.input.TextFieldValue
 import de.westnordost.streetcomplete.ui.common.AutoFitTextFieldFontSize
+import de.westnordost.streetcomplete.ui.util.isImeVisible
 import de.westnordost.streetcomplete.ui.common.SwitchKeyboardPopupButton
 import de.westnordost.streetcomplete.ui.common.TextField2
 
@@ -30,7 +28,6 @@ import de.westnordost.streetcomplete.ui.common.TextField2
  *  - one can switch between text and number software keyboard
  *  - a suggestion can be displayed that is sized the same as the actual input, only with less alpha
  *  - certain common text styling (monospace, centered) */
-@OptIn(ExperimentalLayoutApi::class)
 @Composable
 fun AnAddressNumberInput(
     value: String,
@@ -49,7 +46,7 @@ fun AnAddressNumberInput(
     val keyboardType = if (isAbc) KeyboardType.Text else KeyboardType.Number
 
     var isFocused by remember { mutableStateOf(false) }
-    val showSwitchKeyboardPopup = isFocused && WindowInsets.isImeVisible
+    val showSwitchKeyboardPopup = isFocused && isImeVisible()
 
     ProvideTextStyle(LocalTextStyle.current.copy(
         // to avoid the size of the text changing when going from e.g. "123j" to "123k"

app/src/commonMain/kotlin/de/westnordost/streetcomplete/ui/util/IsImeVisible.kt

@@ -0,0 +1,8 @@
+package de.westnordost.streetcomplete.ui.util
+
+import androidx.compose.runtime.Composable
+
+/** Whether the software keyboard (IME) is currently visible. */
+@Composable
+// TODO CMP: this is necessary as long as https://youtrack.jetbrains.com/issue/CMP-9906/Commonize-WindowInsets.isVisible-functions is not implemented
+expect fun isImeVisible(): Boolean

app/src/iosMain/kotlin/de/westnordost/streetcomplete/ui/util/IsImeVisible.ios.kt

@@ -0,0 +1,6 @@
+package de.westnordost.streetcomplete.ui.util
+
+import androidx.compose.runtime.Composable
+
+@Composable
+actual fun isImeVisible(): Boolean = false