Drop-down list (<select>) not displayed correctly in WPF with 125% or 150% display setting

[ta-stott-oe]

With Display Settings on 125% or 150%, the drop-down part of a select element is displayed with the incorrect size and position. This applies to v1.25.5.0

[ta-stott-oe]

I think this happens because the scale transformation used when there is a non-standard DPI setting isn't applied to popups. I had a poke around in CefSharp.Wpf/WebView.cpp and found I could (apparently) fix the drop-downs by applying the result of GetScaleTransform() to _popup and to the offsets used in SetPopupSizeAndPosition().

[perlun]

Hi,

We have seen this at a customer site using Windows 8, but I haven't had time to look into it yet. Care to make a PR out of it? It would be great! Many thanks in advance.

[perlun]

Re-targetting CefSharp3 now, so it's not forgotten.

[perlun]

Also related to #166. But should probably be fixed after #194.

[JanEggers]

@perlun this one may be closed as well, as #166 is fixed

or did i miss something?

[perlun]

@JanEggers, they are related but not 100% the same. We should verify that it works w/ CefSharp3 before closing I'd say. If you like, give it a try (by switching DPI in Windows) and see if they are positioned correctly.

[perlun]

Take a look at this line. I'm note sure it's entirely relevant though (since I changed the dropdowns to work slightly differently on CefSharp3 compared to CefSharp1), so please investigate if you have time and remove the comments if it does work right.

[brock8503]

@perlun I think I cracked the issue, we did need to add similar transformation to the popup to make sure it scaled correctly.

[jornh]

Closed with merge of #337