[PATCH setup] Show a MessageBox warning if running on a deprecated Windows version

[Jon Turney]

On 14/01/2022 09:04, Corinna Vinschen wrote:
> On Jan 13 15:13, Jon Turney wrote:
>> Show a MessageBox warning if we are running on a Windows version which
>> we have deprecated Cygwin support for:
>>
>> - Windows 6.0 (Windows Vista, Windows Server 2008)
>> - 32-bit Windows
>>
>> This warning can be disabled with '--allow-unsupported-windows'.

I changed this to a separate option '-w'/'--no-warn-deprecated-windows 
(since '--allow-unsupported-windows' has the side effect of effectively 
making '--site' mandatory) and applied this.

>> ---
>>
>> Notes:
>>      Not sure if this is needed, or maybe this is just annoying to the ~3% of
>>      users who are running effected OSes.  But maybe we want to annoy them
>>      into doing something about it?
> 
> Question is, how often should setup show this message?  Every time might
> really be a bit annoying.  Some kind of "I saw it, now leave me alone,
> at least for a while" kind of function would be great.

Yeah, unfortunately that turns this into more effort than I'm going to 
commit to this:

Adding a "Don't show this again" checkbox means we can't use a 
MessageBox, so have design a dialog box for that purpose.

Making that setting persistent means we have to wait until after the 
cygwin root directory is established so we know where to retrieve that 
persistent setting from.