mouse events in black border around desktop area

[mviereck]

xpra v2.2-r17160 on debian 9

If running xpra --start-desktop and maximizing the client window, there can be a black area around the shown desktop if the vfb X server does not provide a matching resolution.

Mouse events (moving and clicks) in the black area should not do anything, but they happen to the outer border of the desktop.

Example: mouse click in black area above clock in xfce4-panel shows calendar, but this should only happen if I click directly on the clock.

Mouse movements in black area above the panel causes highlighting of nearest panel objects.

Not really a problem so far, just different from what I would expect.

[Antoine Martin]

Originally reported in #1656, see ticket:1656#comment:24.

If we swallow pointer motion events, there are some potential problems with seamless mode when the window size does not match its contents exactly: the virtual pointer could linger on the edge of the server side window - which could trigger unwanted behaviour.

[Antoine Martin]

example of black border around the window contents

[Antoine Martin]

there can be a black area around the shown desktop if the vfb X server does not provide a matching resolution.

This is less of a problem nowadays since you can:

• use Xvfb and have perfect match for any resolutions
• Xdummy now has a large set of pre-defined resolutions which should match all possible configurations with a maximum gap of 128 pixels

(converted link to an attachment so it doesn't bitrot)