TD-21742: Window styles are reset when resolution is changed

[Dave Rabelink]

Issue found on (all ??) UNICODE TD versions.

When a dialog/form has removed some window styles to be displayed as captionless/borderless window, these styles are set back by TD when the resolution is changed.
This should not be the case, the styles should remain the same on changing resolution while running the application.

See testcase.
It will create two captionless/borderless windows (a dialog and a form).
While running, change the resolution in Windows.

Afterwards, the caption and borders are back.

Tested on ANSI TD versions, the styles are not changed.
On TD51, the styles are not changed, but the application hangs afterwards (crash)
On TD61/TD62, the styles are changed.

This breaks GUI visualizations on these kind of windows (splashscreens/floating windows)

Before resolution change:

Before_ResolutionChange.png

After resolution change:

After_ResolutionChange.png

(testcase is saved in TD21 format)

Bug_WinStylesSetBackAfterResolutionChange.zip

[Dave Rabelink]

For your information:

Gupta has assigned a defect number for this issue:

TD-21742 : Window styles are reset when resolution is changed