Restore WebView state across Activity recreation in the dashboard widget

The web dashboard is a single HTMX page -- tab switches are client-side
swaps + history.pushState (?tab=shopping), never a real navigation. The
WebView never saved/restored that state, so any Activity recreation
(Android reclaiming a backgrounded Activity, a rotation, anything that
reruns the AndroidView factory with a fresh WebView) fell back to
loadUrl() on the bare server URL in the update block, landing on
whatever tab is default. Reported as "shopping randomly jumps back to
timeline" -- the prior swipe-detection fix (a17a159) addressed a real
but separate false-positive source and didn't touch this path, which
isn't tied to touch input at all.

WebView.saveState/restoreState is the standard mechanism for exactly
this; wired into onSaveInstanceState and the AndroidView factory.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

1 files changed, 19 insertions, 0 deletions

diff --git a/android/app/src/main/java/org/terst/doot/widget/ui/DashboardActivity.kt b/android/app/src/main/java/org/terst/doot/widget/ui/DashboardActivity.kt
index c7cdfaa..597d06b 100644
--- a/android/app/src/main/java/org/terst/doot/widget/ui/DashboardActivity.kt
+++ b/android/app/src/main/java/org/terst/doot/widget/ui/DashboardActivity.kt
@@ -119,6 +119,20 @@ class DashboardActivity : ComponentActivity() {
                                         canGoBack = view.canGoBack()
                                     }
                                 }
+                                // The dashboard's tab switch never does a real navigation --
+                                // it's HTMX swapping #tab-content client-side and recording
+                                // the tab via history.pushState (?tab=shopping etc). Without
+                                // restoring that here, an Activity recreation (Android
+                                // reclaiming a backgrounded Activity, a rotation, anything
+                                // that reruns this factory with a fresh WebView) had nothing
+                                // to fall back on except the bare server URL in `update`
+                                // below, which always lands on the default tab -- reported as
+                                // "shopping randomly jumps back to timeline," but not actually
+                                // tied to being on shopping specifically, just to whichever
+                                // tab you weren't on by default. No-ops harmlessly if
+                                // savedInstanceState has no WebView state to restore (e.g. the
+                                // very first launch).
+                                savedInstanceState?.let { restoreState(it) }
                             }
                         },
                         update = { webView ->
@@ -144,6 +158,11 @@ class DashboardActivity : ComponentActivity() {
         }
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        webViewRef?.saveState(outState)
+    }
+
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
         if (keyCode == KeyEvent.KEYCODE_BACK && webViewRef?.canGoBack() == true) {
             webViewRef?.goBack()