Increase folder cell width slightly.

The increased breathing room makes it more likely that long app names
will fit in the folder cells without being cut off.

Bug: 22462641
Change-Id: I110ede040f9e8fdddbf0c4e7a395ac71435559f3

src/com/android/launcher3/DeviceProfile.java

@@ -229,7 +229,8 @@ public class DeviceProfile {
         hotseatCellHeightPx = iconSizePx;
 
         // Folder
-        folderCellWidthPx = cellWidthPx + 3 * edgeMarginPx;
+        folderCellWidthPx = Math.min(cellWidthPx + 6 * edgeMarginPx,
+                (availableWidthPx - 4 * edgeMarginPx) / inv.numFolderColumns);
         folderCellHeightPx = cellHeightPx + edgeMarginPx;
         folderBackgroundOffset = -edgeMarginPx;
         folderIconSizePx = iconSizePx + 2 * -folderBackgroundOffset;