macOS Mojave: Unclickable region in windows with "hiddenInset" title bar

[javan]

Expected Behavior
Clicking any region of the window should activate the element under the cursor.

Actual behavior
A small region in the top-center of the window isn't clickable.

To Reproduce

• Clone and run https://github.com/javan/electron-quick-start/tree/hidden-inset-mojave
• Click the black bar at the top of the window. It should turn purple while the mouse is down.
• Click the top-center of the black bar and note that it does't turn purple.

$ git clone https://github.com/javan/electron-quick-start.git -b hidden-inset-mojave
$ npm install
$ npm start

Screenshots
macOS Mojave 10.14 Beta (18A384a) 👎

macOS High Sierra 10.13.6 👍

Additional Information
This issue impacts any application with critical navigation elements on the top of the page. For us (Basecamp 3), the "Hey!" menu is very difficult to click:

<notch-joke>

</notch-joke>

It's likely that Mojave will be released this week during the Apple Special Event on September 12.

[javan]

/cc @MarshallOfSound (I think you might be looking into Mojave issues?)

[javan]

It appears that the unclickable region is where the title would be if the window had a standard title bar.

In the gif below there are two stacked windows. The rear window has a standard title bar, and the front window has a hiddenInset title bar. Both have their title set to X.

You can see that the unclickable area of the front window is the same size as the X in the title. Setting a longer title results in a larger unclickable region.

[javan]

Setting the title to an empty string helps, but doesn't totally fix the problem. There's still a small unclickable region about the size of a single character.

[tommoor]

Setting the title to an empty string helps

This doesn't seem like a workable solution considering that title is reflected in all sorts of other areas in the OS? CMD+Tab / Window menu etc?

[javan]

This doesn't seem like a workable solution

It's a workaround, not a solution. YMMV

title is reflected in all sorts of other areas in the OS? CMD+Tab / Window menu etc

I believe CMD+Tab displays the app name (app.getName()) not the window title.

[tommoor]

If it helps we're running Electron 1.8 and also seeing this issue on Mojave, so whatever the issue is has been there for a while - not unique to 3.X and the newer releases

[lehni]

I'm seeing this issue also in https://marketplace.visualstudio.com/items?itemName=lehni.vscode-titlebar-less-macos

[tommoor]

This issue still exists in 5.X and 6.X in macOS Catalina