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The splitter, used f.e. between the Project view and the source editor, doesn't follow the native GTK L&F. It should follow the Nimbus theme specification.
For now due to conflict with mode container borders we will keep current status ie. we will not paint native divider. I attach code patch for painting native divider using SynthPainter. Still this patch is not complete. L&F code switch has to be added ie. if (GTK L&F) then paint native divider.
Created attachment 38096 [details] Patch for painting native divider
moving opened issues from TM <= 6.1 to TM=Dev
There still are issues with the GTK+ L&F, which is outdated and doesn't even match the latest generation of GTK+ themes (Adwaita) at all. IMHO, it would be much better to switch to Nimbus by default on Linux/Unix platforms!