Sugg: Clear message for long XSLT-Transform

[Pierre-de-la-Verre]

When I start a XSLT-transform with e.g. 50MB input, then I see ..

• at first nothing
• then a turning sandclock
• "(not responding)" as additional information in the program title
• heavy load on my CPU-monitor
  and I don't know if the software is dead or not ...

So if you add a message / dialogue / status bar info or something else with
" Started transformation on 11:34:23, wait until final message" ....
the user will now what is going on.

Chris - have a fine weekend!

[lovettchris]

Great suggestion, thanks.

[lovettchris]

I added a progress dialog with a cancel button in these commits and this one in case you want to try it:

The progress only pops up if it takes more than 1 second and the cancel is not perfect, the cancel can only cancel when the transform starts reading input or writing output, but I notice some transforms spend a lot of time doing calculations internally before writing anything so you can still see a pause between the time you try and cancel and when it actually cancels.

[lovettchris]

Fixed in https://github.com/microsoft/XmlNotepad/releases/tag/2.9.0.9