Fixing small regressions from layout tweaks

- Ensure that the caret is the right height
- Ensure that the workspace page spacing matches the workspace padding,
  but just offscreen

Bug: 30021487
Change-Id: Iaf4b33db0f6456b74986638fb6b6af78fc6e1859

src/com/android/launcher3/DeviceProfile.java

@@ -392,7 +392,7 @@ public class DeviceProfile {
             // In portrait, we want the pages spaced such that there is no
             // overhang of the previous / next page into the current page viewport.
             // We assume symmetrical padding in portrait mode.
-            return Math.max(defaultPageSpacingPx, 2 * getWorkspacePadding(null).left);
+            return Math.max(defaultPageSpacingPx, getWorkspacePadding(null).left + 1);
         }
     }