Add support for accent color on windows border

[maratnugmanov]

Windows 11 (and 10) has an option to "Show accent color on title bar and windows border" (Settings > Personalization > Colors, then click on the Accent Color to show more options) and this greatly improves visual differentiation between active and inactive windows by adding a 1px window border of selected color to the active window. Setting "window.titleBarStyle" set to "native" makes this possible by adding basically useless blank Windows Title Bar, which is a step back. Chrome-based browsers, JetBrains IDEs, and many other Windows apps support accent color on windows border while all of them having a custom title bar. Please have a look into it, this is very useful feature for us older (or should i say blinder) guys. Thanks.

[bpasero]

Agree this would be cool, probably needs support from Electron

fyi @codebytere @deepak1556

[deepak1556]

Picking the accent color from system settings is already available via from https://issues.chromium.org/issues/40196251

We would need to set the border accent colors based on these values similar to https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ui/color/win/native_chrome_color_mixer_win.cc;l=180-191? and update the frame drawing code using https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ui/views/frame/browser_frame_view_win.cc;l=693-717 as a example.

This might not be straight forward, since cutom titlebar implementation in Electron is bit different from chrome in that the system draws the titlebar via WS_CAPTION and we later remove it by extending client area via DWM. So, working on the feature should ensure we don't regress the issues addressed by https://github.com/electron/electron/blob/bea7d618f1916d196e0a68c05f17a7ada286056f/shell/browser/ui/win/electron_desktop_window_tree_host_win.cc#L49-L89