Code change:
<!-- Do Not Delete This! bugreporttemplate --<!-- Please read our Rules of Conduct: --<!-- Read our guide about submitting issues: --<!-- Search existing issues to avoid creating duplicates. --<!-- Test using the latest Insiders build to see if your issue has already been fixed: --<!-- Instead of creating your report here, use 'Report Issue' from the 'Help' menu in VS Code to pre-fill useful information. --<!-- Launch with to check. --Does this issue occur when all extensions are disabled?: Yes <!-- If you answered No above, use 'Help: Start Extension Bisect' from Command Palette to try to identify the cause. --<!-- Issues caused by an extension need to be reported directly to the extension publisher. The 'Help Report Issue' dialog can assist with this. --- VS Code Version: 1.66.0 (x64) OS Version: 10.0. Build (Window 10) Steps to Reproduce: VS Code (or use the shortcut ) the first miliseconds after opening a new instance of VS Code, a "Window 7"-like window frame layout appears, before the usual VS Code look shows up (see the attached GIF). The GIF below first shows the expected behavior, opening version 1.65.0, followed by the current behavior of version 1.66.0. ! The two executables were downloaded from: and
Refs
that's the reason I went back to 1.65, frames are so annoying.
Hi just a small update: I've downloaded the latest VS Code Insiders and the problem now only appears when launching VS Code for the first time, but no longer when opening new windows from a running instance of it.
This issue persists in the new latest version release, .
The issue persists in today's release, .
Since the related bug in the Electron repo has a label, and today's VSCode uses , I believe we will be experiencing this bug for months.
The upstream Electron issue is at The issue was introduced in Electron v14.0.0-beta.5 and the commit that introduced the issue is The PR fixes the issue where frameless resizable windows show Windows 7 frames during startup, but there's a larger issue that is still unresolved even with that PR. I also searched through the thousands of to see whether they had anything to do with the issue, but I didn't find anything relevant even after reverting several suspicious commits. Running with Electron v14.0.0-beta.5 or newer on Windows 10 reproduces the issue. The PR fixes the issue for frameless resizable windows by calling at an earlier stage of program initialization. Assume the window is frameless and resizable. Then, the program sets to earlier in , and the following occurs: is not run, meaning is not removed from the style set in Line 62. This style parameter is passed in to a call at . is not run. Instead, the block above is run, which adds a style to the style passed into the call. , because of these styles being passed in, after the window is shown, we get a single message, and no messages after. NC in this case refers to non-client area, which is the frame. DWM stands for desktop windows manager. After adding a long of 30 seconds to the call above, I was able to use Spy++ to log messages to that window and see the following: I have also attached full logs to the end of this comment. For frameless windows that cannot resize, even if we call earlier, because the program would pass in , for the and calls above, the style would not be in the styles sent to the calls. As a result, what I see in Spy++ is being toggled three times, and several calls that result in messages being emitted. Using Spy++, I confirmed that the calls have the flag set. I have searched the Chromium and Electron codebases for and (as well as ) to see why the frame might be rendering more often when is not passed in. However, I haven't found anything within the codebase itself. Searching Windows documentation, I found the following: causes to be sent. Reference: However, I'm not sure whether this could explain the difference in behaviour between resizable and non-resizable windows. can pass in or to send to the window, which is why I searched for those two constants within the codebase. Reference: Also, Chromium handles by returning at , which I assume causes the message to occur. Also, Electron calls at . I noticed that if I don't call there, the Windows 7 frame doesn't show up, but then the Electron window doesn't render with the proper style (see ). I also noticed that when the Windows 7 frame shows up, it has the style of whatever was passed into that specific call. For example, if I add to the call, then for a second I see a Windows 7 frame with applied. I also tried creating a minimal project in VS to reproduce the issue but wasn't successful. The frame that rendered seemed to have a Windows 10 style rather than a Windows 7 one. I also tried registering a listener in for the messages, and it did seem to get hit, though I couldn't do anything with it. There's also the mysterious , but I wasn't able to apply it to resolve the issue.
The PR that linked above (partially based on ) should resolve the issue for VS Code Insiders and hence close this issue, but there's still more I'd like to investigate, especially for frameless non-resizable windows. I some lines to log the hwnd and style passed into each relevant and call. One example of the styles that show up: There's also another window being created really early, but I don't think it influences the issue. Good scenario (meaning no frame showing) with set to and staying Bad scenario with set to then Bad scenario with set to and staying The call with style causes the Windows 7 frame to render, and its style corresponds to is actually the same style just with , once again showing how mysterious the constant is. While working on , I also noticed that changing the order of the calls seemed to fix the issue for frameless non-resizable windows. In particular, on the Electron side, in , if I first called to pretend that the window is resizable, and then called (where ) after the call around line 365, then the issue is resolved even for frameless non-resizable windows. However, this workaround delays the call to hundreds of lines later, and I wouldn't be surprised if it would cause a regression elsewhere. Just like in the log file of the good case of the previous comment, only shows up once, rather than three times. For completeness, here are the logs with the styles for this scenario, excluding the logs: In this case, the style never comes up! I also tried delaying the call and calling instead of , but that doesn't work because it fails to pass to the call as well as the first call, both of which need for the frame not to render: can be used to change the non-client (NC) rendering policy and hence result in a call. However, I did not find any references to within the Electron and Chromium codebases that were actually called when running my minimal repro.
lets continue the investigation in
<!-- AUTHORVERIFICATIONREQUEST --This bug has been fixed in the latest release of ! you can help us out by commenting if things are now working as expected. If things still don't seem right, please ensure you're on version of Insiders (today's or later - you can use in the command palette to check), and leave a comment letting us know what isn't working as expected. Happy Coding!
/verified

Related discussion:
text: resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.4.207.tgz#9c3310ebace2952903d05dcaba8abe3a4ed44c01" integrity sha512-piH7MJDJp4rJCduWbVvmUd59AUne1AFBJ8JaRQvk0KzNTSUnZrVXHCZc+eg+CGE4OujkcLJznhGKD6tuAshj5Q== <del> electron@19.0.11: version "19.0.11" resolved "https://registry.yarnpkg.com/electron/-/electron-19.0.11.tgz#0c0a52abc08694fd38916d9270baf45bb7752a27" integrity sha512-GPM6C1Ze17/gR4koTE171MxrI5unYfFRgXQdkMdpWM2Cd55LMUrVa0QHCsfKpsaloufv9T65lsOn0uZuzCw5UA== </del> <ins> electron@19.0.12: version "19.0.12" resolved "https://registry.yarnpkg.com/electron/-/electron-19.0.12.tgz#73d11cc2a3e4dbcd61fdc1c39561e7a7911046e9" integrity sha512-GOvG0t2NCeJYIfmC3g/dnEAQ71k3nQDbRVqQhpi2YbsYMury0asGJwqnVAv2uZQEwCwSx4XOwOQARTFEG/msWw== </ins> dependencies: "@electron/get" "^1.14.1" "@types/node" "^16.11.26"