android: fix progress bar gap (#726)

androidx.compose.material3 1.3.0 added a gap between the active and inactive track and a stop indicator at the end. Here, we add a negative gap to compensate for the rounded cap occupying extra space past the end of the progress, and use an empty function to hide the indicator.

Fixes tailscale/corp#35495

Signed-off-by: kari-ts <kari@tailscale.com>

Author: kari-ts

android/src/main/java/com/tailscale/ipn/ui/view/SharedViews.kt

@@ -126,10 +126,15 @@ fun SimpleActivityIndicator(size: Int = 32) {
 
 @Composable
 fun ActivityIndicator(progress: Double, size: Int = 32) {
+  // LinearProgressIndicator defaults to a 4.dp height in Material3.
+  val height = 4.dp
+  
   LinearProgressIndicator(
-      progress = progress.toFloat(),
+      progress = {progress.toFloat()},
       modifier = Modifier.width(size.dp),
       color = ts_color_light_blue,
       trackColor = MaterialTheme.colorScheme.secondary,
+      gapSize = -height,
+      drawStopIndicator = {}
   )
 }