MessageDialog.ShowModalWithin frequently causes the parent window to blink

Targets Windows
1

<https://xojo.com/issue/63140>

“Using MessageDialog.ShowModalWithin often causes the parent window to blink. The content behind the parent seems to play a role, as the IDE does it sometimes but Chrome does it nearly every time. It seems almost as if the windows are cycling.”

The feedback report contains a sample project and demo videos. Posted here to gain awareness, as this is a rather obnoxious bug.

2

I looked the video, yup pretty strange.

I wonder if when a modal window , in fact any window maybe, is shown a message is sent to the window behind. But that would be carried out by the OS.

What happens if the modal window is completely contained within the parent ?

3

I have never used MessageDialog.ShowModalWithin, it looks like in Windows should work the same as ShowModal right?

4

My alerts all go through helper methods, so my workaround strategy is to switch to ShowModal on Windows. But a bug is a bug even if worked around.

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