Visual artifacts on HIDPI displays

Hi Andrei,

Which DPI are you at?  When you use DPIs that aren't at proper pixel scale factors (like 150%), it can make lines not always anti-alias on the correct pixel, or sometimes not align exactly where you want.  This issue shouldn't generally show up at full scale factors (like 100%, 200%, 300%, etc.).

Our TabItemBorder control has a two-phase approach for rendering a tab.  It first renders the background, trying to offset the background by the border width.  We do that because when hovering over an unselected tool window tab, we want the background to show but the border for that tab is transparent, and we want the border of the parent tabstrip to show at the top of the tab (since tabs overlay the tabstrip by a pixel).  If we didn't offset the background by the border width, the hover tab's background would render on top of that tabstrip line.  The border (if non-transparent) for the tab is then rendered on top.

The downside of this seems to be in the non-full scale factors where the anti-aliasing of that background combined with the anti-aliasing of the border doesn't yield a solid transition, as in your first screenshot.

That being said, I believe we were able to find a way to improve the rendering of your first scenario to create a solid transition.  This update will be in the next maintenance release.

Thanks for answer.

My display have 163 DPI. And you are right, I use 150% scale factor.

I am looking forward to updates.