Window is outside visible screen on multi monitor setup

[tripplet]

Hi,

DebugView can start offscreen if the x or y stored in the registry are to big.

The code at: https://github.com/CobaltFusion/DebugViewPP/blob/8a2f58b16498768361c38b80b0f7f533fe54d499/DebugView%2B%2B/MainFrame.cpp#L674-L678 Seems to be there to fix this, but this does not work if the primary monitor is on the right side. GetSystemMetrics(SM_CXVIRTUALSCREEN) gives the full multi monitor width but the range in reality is for example -1920 to 1920, where x=0 is on the left side of the right (primary) monitor. The error can be reproduced with changing the primary monitor between execution (At least on my windows 10 machine). Maybe this behavior is different on older versions of windows, I don't known.

See: https://blogs.msdn.microsoft.com/oldnewthing/20100820-00/?p=13093

Best solution seems to be described here: https://msdn.microsoft.com/de-de/library/windows/desktop/dd162826.aspx

Sadly I currently don't have a vsstudio setup for creating a proper pull request with the change.

Hope this minor announce can be fixed.

Thanks Tobi

[janwilmans]

Great analysis, I have seen this, but until now did not understand why it was happening... I think I'll be able to fix it now :)

[janwilmans]

Tested, this is the error scenario:

• make left screen main display
• put debugview++ on the right screen
• close debugview++
• make right screen main display
• start debugview++ : it will not show up
• use to get it back:
  • click debugview++ on the taskbar to focus it (will not show yet)
  • press and hold 'windows button' and press 'left-arrow' cursor key to get it back

Also tested on windows 8.1 and windows 7. @tripplet your fix worked, thanks ! and thanks for explaining why it works :)