An incorrect area of text is highlighted after using 'Home' or 'End' keys.

Example to reproduce:

1: Text editor with several lines of text (at least two)
2: Position cursor midway along a line (not on the last line)
3: Press the 'Home' key (cursor should move to column 0 of current line)
4: Hold down the 'Shift' key and press 'Down'
5: The entire line is highlighted plus the portion of the next line upto the column where the cursor was located before the 'Home' key was pressed.

Actually the cursor 'Up' or 'Down' movement is incorrect at step 4 (no need to hold down the 'Shift' key). However I noticed this when highlighting text so that's how it's reported.