GitHub - tracktownsoftware/HighDpiMdiTest-cpp: Show issue with High Dpi and MDI child window. See Readme.htm.

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Name		Name	Last commit message	Last commit date
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l.jpn		l.jpn
.gitattributes		.gitattributes
.gitignore		.gitignore
HighDefMdiChildIssue.JPG		HighDefMdiChildIssue.JPG
ReadMe.htm		ReadMe.htm
bounce.cpp		bounce.cpp
bounce.h		bounce.h
hello.cpp		hello.cpp
hello.h		hello.h
hello.ico		hello.ico
mainfrm.cpp		mainfrm.cpp
mainfrm.h		mainfrm.h
makefile		makefile
mdi.cpp		mdi.cpp
mdi.h		mdi.h
mdi.ico		mdi.ico
mdi.mak		mdi.mak
mdi.rc		mdi.rc
mdi.sln		mdi.sln
mdi.vcxproj		mdi.vcxproj
mdi.vcxproj.filters		mdi.vcxproj.filters
resource.h		resource.h
stdafx.cpp		stdafx.cpp
stdafx.h		stdafx.h

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This project was cloned from 
https://github.com/microsoft/VCSamples/tree/master/VC2010Samples/MFC/general/mdi

To show this bug I had to enable DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2. I did this by
1) Set DPI Awareness to None in project "Properties | Configuration Properties | Manifest Tool Input and Output | DPI Awareness"
2) Added this code to mdi.cpp:  SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);

To see the bug:
1) Set display to 100%
2) Run the app and display a Child MDI using "File|New Bounce" or "File|New Hello"
3) Maximize the child window
4) Leave the app running and change the display to a GREATER value: If step 1 was 100% then set to 175% or greater
5) The maximized MDI child window no longer fills the MDI parent accurately. See the uploaded HighDefMdiChildIssue.JPG.