Fix screenshots missing the bottom line of pixels

stardot / b-em

An opensource BBC Micro emulator for Win32 and Linux

http://stardot.org.uk/forums/viewtopic.php?f=4&t=10823

GNU General Public License v2.0

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Fix screenshots missing the bottom line of pixels #220

Closed komadori closed 5 months ago

komadori commented 5 months ago

Screenshots created with the built-in feature are missing the bottom line of pixels. This PR changes the calculation of ysize in save_screenshot to match the one in blit_screen. This makes sense if firsty and lasty form an inclusive range.