Prevents cropping of shortcuts in the app popup menu by limiting rows to available screen space.

 - Limit the number of shortcut rows shown to what will fit the screen.
 - Fix drag testDragShortcut so that it works for all screen sizes.
 - Prevent cropping and misalignment of shortcut text.

Bug: 247880037
Fixes: 275115239
Test: locally on different devices, and with Display Size set to different sizes
Change-Id: I18b27ec302c34d1d801171ab18c64169a9f252ee