feat: trigger channel scan dialog when users paste a new valid URL

app/src/main/java/com/geeksville/mesh/ui/ChannelFragment.kt

@@ -49,6 +49,7 @@ import androidx.compose.material.icons.twotone.Check
 import androidx.compose.material.icons.twotone.Close
 import androidx.compose.material.icons.twotone.ContentCopy
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
@@ -321,6 +322,11 @@ fun ChannelScreen(
                     channelSelections = channelSelections,
                     onClick = { showChannelEditor = true }
                 )
+                EditChannelUrl(
+                    enabled = enabled,
+                    channelUrl = selectedChannelSet.getChannelUrl(),
+                    onConfirm = viewModel::requestChannelUrl
+                )
             }
         } else {
             dragDropItemsIndexed(
@@ -354,14 +360,6 @@ fun ChannelScreen(
             }
         }
 
-        item {
-            EditChannelUrl(
-                enabled = enabled,
-                channelUrl = selectedChannelSet.getChannelUrl(),
-                onConfirm = viewModel::requestChannelUrl
-            )
-        }
-
         item {
             DropDownPreference(title = stringResource(id = R.string.channel_options),
                 enabled = enabled,
@@ -419,6 +417,13 @@ private fun EditChannelUrl(
     var valueState by remember(channelUrl) { mutableStateOf(channelUrl) }
     var isError by remember { mutableStateOf(false) }
 
+    // Trigger dialog automatically when users paste a new valid URL
+    LaunchedEffect(valueState, isError) {
+        if (!isError && valueState != channelUrl) {
+            onConfirm(valueState)
+        }
+    }
+
     OutlinedTextField(
         value = valueState.toString(),
         onValueChange = {