Make selected, onfocused tree row highlight color on Linux more distinct
Make selected, onfocused tree row highlight color on Linux more distinct

By default it's very close to the alternating row color (even in Places)

https://forums.zotero.org/discussion/56942/

retorquere/zotero,LinuxMercedes/zotero,sendecomp/zotero,gracile-fr/zotero,gracile-fr/zotero,LinuxMercedes/zotero,LinuxMercedes/zotero,retorquere/zotero,gracile-fr/zotero,rmzelle/zotero,retorquere/zotero,sendecomp/zotero,sendecomp/zotero,rmzelle/zotero,rmzelle/zotero