bcabeab0f8
In bug 1773342 I made OS text scale factor behave like a full zoom factor which applies to all pages (including the browser chrome). That's generally straight forward but it makes some callsites that use unzoomed CSS coordinates misbehave (or behave correctly accidentally actually in some other cases). The main fix here is making nsIBaseWindow::UnscaledDevicePixelsPerCSSPixel() and nsIScreen::GetDefaultCSSScaleFactor() account for OS zoom as necessary. However, I also went through the relevant code and cleaned it up to use typed units and operations when possible. The setup means: * nsIWidget::GetDefaultScale() doesn't account for OS full zoom. * nsIBaseWindow and nsIScreen does. These are the places where this should matter and stuff can get confused, but this works surprisingly well for all callers (except one nsDeviceContext one which we use only for PuppetWidget and we can remove by falling back to 1.0 like all other widgets until the update comes). Differential Revision: https://phabricator.services.mozilla.com/D149033
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