Created attachment 187671 [details] Mockup showing no line (current) vs. line SUMMARY Tab bars are supposed to have a separator line spanning the whole width of the tab bar. It seems like it used to be the case in applications such as Dolphin, but there has been a regression or a bug causing it not to appear anymore. Some apps have most of the line (like Kate) or small parts of it only (like Konsole, under the command palette button). STEPS TO REPRODUCE 1. Open Dolphin, Konsole, Okular or Kate. 2. Open a second tab. OBSERVED RESULT The horizontal separator line is absent or it does not span the whole width of the tab container. EXPECTED RESULT The horizontal line should consistently span the width of the tab bar container across all applications using tabs. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.21.0 Qt Version: 6.10.1 Kernel Version: 6.17.9-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 32 × 13th Gen Intel® Core™ i9-13900HX Memory: 32 GiB of RAM (31.1 GiB usable) Graphics Processor 1: Mesa Intel® Graphics Graphics Processor 2: NVIDIA GeForce RTX 4090 Laptop GPU/PCIe/SSE2 ADDITIONAL INFORMATION Some users are reporting that they do see the line, notably around Plasma version 6.3.5 - https://www.reddit.com/r/kde/comments/1pn9cu1/comment/nu65jl9/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button - https://bugs.kde.org/show_bug.cgi?id=505176 - https://www.reddit.com/r/kde/comments/1pn9cu1/comment/nu6daua/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button
Created attachment 187672 [details] Close up of the mockup
I discovered that this is caused by scaling. For instance, I use my 16:10 1440p monitor at 125% scaling. If I set it to 200% scaling, I do see the lines.
Created attachment 187677 [details] Line visible at 200% scaling
Hi ! I can confirm, same problem here on : Operating System: Fedora Linux 43 KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.21.0 Qt Version: 6.10.1 Kernel Version: 6.17.11-300.fc43.x86_64 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 PRO 4750U with Radeon Graphics Memory: 32 Gio of RAM (29.1 Gio usable) Graphics Processor: AMD Radeon Graphics Manufacturer: LENOVO Product Name: 20Y1CTO1WW System Version: ThinkPad P14s Gen 1 Switching to 100% solve the problem, but is not usable on my screen. Thank you for your report, Alexandre