Fix testTag not working for gesture detection

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- Fix testTag not working for Jetpack Compose user interaction tracking ([#3878](https://github.com/getsentry/sentry-java/pull/3878))
+
 ## 7.18.0
 
 ### Features

sentry-compose-helper/src/jvmMain/java/io/sentry/compose/gestures/ComposeGestureTargetLocator.java

@@ -1,5 +1,6 @@
 package io.sentry.compose.gestures;
 
+import androidx.compose.ui.Modifier;
 import androidx.compose.ui.geometry.Rect;
 import androidx.compose.ui.layout.ModifierInfo;
 import androidx.compose.ui.node.LayoutNode;
@@ -13,6 +14,7 @@
 import io.sentry.compose.helper.BuildConfig;
 import io.sentry.internal.gestures.GestureTargetLocator;
 import io.sentry.internal.gestures.UiElement;
+import java.lang.reflect.Field;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -90,13 +92,28 @@ public ComposeGestureTargetLocator(final @NotNull ILogger logger) {
               }
             }
           } else {
+            final @NotNull Modifier modifier = modifierInfo.getModifier();
             // Newer Jetpack Compose 1.5 uses Node modifiers for clicks/scrolls
-            final @Nullable String type = modifierInfo.getModifier().getClass().getCanonicalName();
+            final @Nullable String type = modifier.getClass().getCanonicalName();
             if ("androidx.compose.foundation.ClickableElement".equals(type)
                 || "androidx.compose.foundation.CombinedClickableElement".equals(type)) {
               isClickable = true;
             } else if ("androidx.compose.foundation.ScrollingLayoutElement".equals(type)) {
               isScrollable = true;
+            } else if ("androidx.compose.ui.platform.TestTagElement".equals(type)) {
+              // Newer Jetpack Compose uses TestTagElement as node elements
+              // See
+              // https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/ui/ui/src/commonMain/kotlin/androidx/compose/ui/platform/TestTag.kt;l=34;drc=dcaa116fbfda77e64a319e1668056ce3b032469f
+              try {
+                final Field tagField = modifier.getClass().getDeclaredField("tag");
+                tagField.setAccessible(true);
+                final @Nullable Object value = tagField.get(modifier);
+                if (value instanceof String) {
+                  lastKnownTag = (String) value;
+                }
+              } catch (Throwable e) {
+                // ignored
+              }
             }
           }
         }

sentry-compose/proguard-rules.pro

@@ -12,6 +12,7 @@
 -keepnames class androidx.compose.foundation.ClickableElement
 -keepnames class androidx.compose.foundation.CombinedClickableElement
 -keepnames class androidx.compose.foundation.ScrollingLayoutElement
+-keepnames class androidx.compose.ui.platform.TestTagElement { *; }
 
 # R8 will warn about missing classes if people don't have androidx.compose-navigation on their
 # classpath, but this is fine, these classes are used in an internal class which is only used when