feature: add runtime func WindowSetAlwaysOnTop

[chenxiao1990]

This PR resolves feature request #1439.
Add windows 、linux platform WindowSetAlwaysOnTop function .
Darwin platform no environment , Not implemented.
JS runtime interface Not implemented.

[leaanthony]

Thanks for opening this. A few things:

• there's already functions for top level windows that we call during startup so we should reuse those
• It looks like the calls to set and unset the top window are the same
• We'd need to add a JavaScript method for completeness
• The docs will need updating with the new runtime method

It's a good start though! 👍

[chenxiao1990]

Thanks for opening this. A few things:

• there's already functions for top level windows that we call during startup so we should reuse those
• It looks like the calls to set and unset the top window are the same
• We'd need to add a JavaScript method for completeness
• The docs will need updating with the new runtime method

It's a good start though! 👍

Because sometimes we need to dynamic set top/untop , so startup option is not enough.

Fix set and unset the top window are the same , i add WindowSetUnalwaysOnTop func.

[chenxiao1990]

Thanks for opening this. A few things:

• there's already functions for top level windows that we call during startup so we should reuse those
• It looks like the calls to set and unset the top window are the same
• We'd need to add a JavaScript method for completeness
• The docs will need updating with the new runtime method

It's a good start though! 👍

add a JavaScript method for completeness
The docs updating with the new runtime method

[leaanthony]

This is looking good! Do you think we should refactor it so that we have a single API call WindowSetAlwaysOnTop(bool) ?

[chenxiao1990]

Yes, i think a single api call WindowSetAlwaysOnTop(bool) is a good idea.
I will modify it.

[leaanthony]

LGTM!