[fenix] For https://github.com/mozilla-mobile/fenix/issues/20257 - Sets min no. of grid columns to 2 in TabsTray

app/src/main/java/org/mozilla/fenix/tabstray/ext/Context.kt

@@ -15,5 +15,5 @@ internal val Context.numberOfGridColumns: Int
     get() {
         val displayMetrics = resources.displayMetrics
         val screenWidthDp = displayMetrics.widthPixels / displayMetrics.density
-        return (screenWidthDp / MIN_COLUMN_WIDTH_DP).toInt()
+        return (screenWidthDp / MIN_COLUMN_WIDTH_DP).toInt().coerceAtLeast(2)
     }

app/src/test/java/org/mozilla/fenix/tabstray/browser/DefaultBrowserTrayInteractorTest.kt

@@ -5,10 +5,13 @@
 package org.mozilla.fenix.tabstray.browser
 
 import android.content.Context
+import android.content.res.Resources
+import android.util.DisplayMetrics
 import androidx.recyclerview.widget.GridLayoutManager
 import io.mockk.every
 import io.mockk.mockk
 import io.mockk.mockkStatic
+import io.mockk.spyk
 import io.mockk.unmockkStatic
 import org.junit.After
 import org.junit.Assert.assertEquals
@@ -79,4 +82,20 @@ class DefaultBrowserTrayInteractorTest {
         // Should NOT be 4.
         assertEquals(1, (result as GridLayoutManager).spanCount)
     }
+
+    @Test
+    fun `WHEN screen density is very low THEN numberOfGridColumns will still be a minimum of 2`() {
+        val context = mockk<Context>()
+        val resources = mockk<Resources>()
+        val displayMetrics = spyk<DisplayMetrics> {
+            widthPixels = 1
+            density = 1f
+        }
+        every { context.resources } returns resources
+        every { resources.displayMetrics } returns displayMetrics
+
+        val result = context.numberOfGridColumns
+
+        assertEquals(2, result)
+    }
 }