[Bug]: Windowing Issues in Electron and Chromium

[LSeelig]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

29.1.5

What operating system are you using?

Other Linux

Operating System Version

Fedora Linux 39 (Workstation Edition)

What arch are you using?

x64

Last Known Working Electron version

No response

Expected Behavior

Windows display, maximize, split tile, and move without graphical glitches and inconsistences

Actual Behavior

I know this is not how actual behavior should be used, but I am submitting this on my own time. If the layout is too messy, disregard or remove this report.

Please see additional information for my notes, along with attached screenshots, on the windowing behavior. I include notes on Chromium too because some of this will need to be fixed upstream, and I hope to send this there, but I can't quite tell what is peculiar to electron vs chromium.

Testcase Gist URL

No response

Additional Information

Chromium and Electron
Both Have Chromium version 122.0.6261.0
Electron ver Electron v29.1.5

No scaling
Maximized/Splitscreen to Splitscreen: Electron has a single-pixel gap above and to left of title bar (screenshot 1) and some bugginess (screenshot 2)

Non-maximized to Splitscreen: Electron breaks, expanding right (both right and left tile expand right), graphical errors very slight on top bar (expands past windows, can see behind top of title bar, barely) (see screenshot)

Large text (125% text scaling)
Splitscreen chromium shows main window extending slightly right beyond the title bar (screenshot)

Electron unaffected (DOES NOT SCALE TEXT which violates accessibility)

Fractional Scaling (125%)

Electron - Scrollbar extends slightly out of window (screenshot) (only tested in windowed electron, might have seen in chromium)

Chromium - Title bar enlarges, shadowing sometimes expands on left and right further than main content, when tiled either left or right (Screenshots)

Electron - Intense graphical glitching around titlebar in full and splitscreen; titlebar width less than window content (couldn't easily capture in screenshot, as they resolved whenever I tried. Schrodinger's window, I guess)

Electron - Single-pixel gap above and to the left persists when maximized or splitscreened (screenshot); it is more appearant when scaled

Electron and Chromium - When windowed, shadows/boundaries drawn slightly outside of window content (screenshot)

Electron: Non-maximized to splitscreen behavior persists

Fedora KDE: Doesn't seem to have the same issues by default, but I will note this might be a problem with chromium's gtk implementaiton, instead of GNOME's mutter implementation, as it shows similar issues if switched from chrome://settings/appearance to "Use GTK" and "Use QT" doesn't work at all, but can "Use system title bar and borders" by right clicking the top of the window.
There is what might be a font rendering/spacing issue when fractional scaling.

I omitted testing an integer scale (i.e. 200%). I apologize; I am pretty busy.

[electron-issue-triage]

Hello @LSeelig. Thanks for reporting this and helping to make Electron better!

Would it be possible for you to make a standalone testcase with only the code necessary to reproduce the issue? For example, Electron Fiddle is a great tool for making small test cases and makes it easy to publish your test case to a gist that Electron maintainers can use.

Stand-alone test cases make fixing issues go more smoothly: it ensure everyone's looking at the same issue, it removes all unnecessary variables from the equation, and it can also provide the basis for automated regression tests.

Now adding the blocked/need-repro Needs a test case to reproduce the bug label for this reason. After you make a test case, please link to it in a followup comment. This issue will be closed in 10 days if the above is not addressed.

[LSeelig]

Hello @LSeelig. Thanks for reporting this and helping to make Electron better!

Would it be possible for you to make a standalone testcase with only the code necessary to reproduce the issue? For example, Electron Fiddle is a great tool for making small test cases and makes it easy to publish your test case to a gist that Electron maintainers can use.

Stand-alone test cases make fixing issues go more smoothly: it ensure everyone's looking at the same issue, it removes all unnecessary variables from the equation, and it can also provide the basis for automated regression tests.

Now adding the blocked/need-repro Needs a test case to reproduce the bug label for this reason. After you make a test case, please link to it in a followup comment. This issue will be closed in 10 days if the above is not addressed.

This isn't relevant to issue. The issue occurs with the base/demo package.