Explorations in dense grids for all apps.

- Adds sticky section headers
- Removing AppsListAdapter
- Adding search bar field
- Subtitle filtering

Bug: 20222023

Change-Id: I1eaef701b5d68f475615f09d86561eacc91c937f

src/com/android/launcher3/DeviceProfile.java

@@ -428,6 +428,13 @@ public class DeviceProfile {
     }
 
     public boolean updateAppsViewNumCols(Resources res, int containerWidth) {
+        if (AppsContainerView.GRID_HIDE_SECTION_HEADERS) {
+            if (appsViewNumCols != allAppsNumCols) {
+                appsViewNumCols = allAppsNumCols;
+                return true;
+            }
+            return false;
+        }
         int appsViewLeftMarginPx =
                 res.getDimensionPixelSize(R.dimen.apps_grid_view_start_margin);
         int availableAppsWidthPx = (containerWidth > 0) ? containerWidth : availableWidthPx;