fix(widget): stop tomorrow's events from stretching today's grid bounds

calcGridStart/calcGridEnd only looked at hour-of-day, so a tomorrow
event's early or late hour could inflate today's grid range with empty
rows, pushing the non-scrolling TomorrowSection below the widget's
visible area. Filter to today-only events before computing bounds.

1 files changed, 34 insertions, 0 deletions

diff --git a/android/app/src/test/java/org/terst/doot/widget/ui/DootWidgetGridTest.kt b/android/app/src/test/java/org/terst/doot/widget/ui/DootWidgetGridTest.kt
new file mode 100644
index 0000000..b3d8384
--- /dev/null
+++ b/android/app/src/test/java/org/terst/doot/widget/ui/DootWidgetGridTest.kt
@@ -0,0 +1,34 @@
+package org.terst.doot.widget.ui
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.terst.doot.widget.data.WidgetItem
+
+class DootWidgetGridTest {
+
+    private fun tomorrowEvent(startIso: String, endIso: String): WidgetItem = WidgetItem(
+        id = "tmrw", title = "Tomorrow Event", source = "calendar", type = "event",
+        start = startIso, end = endIso
+    )
+
+    @Test
+    fun `calcGridStart on an unfiltered mixed list is skewed by tomorrow's event hour`() {
+        // Documents why WidgetRoot MUST pre-filter to today-only events before calling
+        // this function: it has no date awareness, only hour-of-day. "now" is 22:00
+        // today (2026-07-12); the only item is tomorrow's (2026-07-13) 10:00 event.
+        val mixedList = listOf(tomorrowEvent("2026-07-13T10:00:00Z", "2026-07-13T14:30:00Z"))
+        assertEquals(9, calcGridStart(mixedList, nowHour = 22))
+    }
+
+    @Test
+    fun `calcGridStart on the correctly today-filtered (empty) list falls back to nowHour`() {
+        val gridStart = calcGridStart(emptyList(), nowHour = 22)
+        assertEquals(21, gridStart)
+    }
+
+    @Test
+    fun `calcGridEnd falls back to nowHour plus eight when no today events, capped at 23`() {
+        val gridEnd = calcGridEnd(emptyList(), nowHour = 22)
+        assertEquals(23, gridEnd)
+    }
+}