Add Modifier.withBaseline()

core/ui/compose/common/src/main/kotlin/app/k9mail/core/ui/compose/common/baseline/BaselineModifier.kt

@@ -0,0 +1,31 @@
+package app.k9mail.core.ui.compose.common.baseline
+
+import androidx.compose.foundation.layout.RowScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.FirstBaseline
+import androidx.compose.ui.layout.LastBaseline
+import androidx.compose.ui.layout.layout
+import androidx.compose.ui.unit.Dp
+
+/**
+ * Adds a baseline to a Composable that typically doesn't have one.
+ *
+ * This can be used to align e.g. an icon to the baseline of some text next to it. See e.g. [RowScope.alignByBaseline].
+ *
+ * @param baseline The number of device-independent pixels (dp) the baseline is from the top of the Composable.
+ */
+fun Modifier.withBaseline(baseline: Dp) = layout { measurable, constraints ->
+    val placeable = measurable.measure(constraints)
+    val baselineInPx = baseline.roundToPx()
+
+    layout(
+        width = placeable.width,
+        height = placeable.height,
+        alignmentLines = mapOf(
+            FirstBaseline to baselineInPx,
+            LastBaseline to baselineInPx,
+        ),
+    ) {
+        placeable.placeRelative(x = 0, y = 0)
+    }
+}