android TableLayout and drawable – unwanted space on right bottom (unwanted shadow)-Collection of common programming errors

Does android drawable shape contain by default any space on right and bottom (some kind of default shadow)?

I have TableLayout with very simple definition

Next for some rows I have buttons and for some LinearLayout with border defined as drawable (no any other elements in LinearLayout):

Unfortunately comparing to the row with buttons, the row with drawable is slightly shorter. Moreover there is some unexpected space between rows. I have impression (when playing with setting pink color as background for TableLayout) that android adds some kind of unwnted shadow by default for drawable (on right and bottom part). Why? How can I remove it?