Browser windows spread across workspaces upon restore

[Jaime Hunter]

This bug has shown up in every version of Linux Mint I have used (currently 18.3 Cinnamon 64-bit). It occurs by doing the following: Immediately after initiating restore of a multi-window browser session (e.g. FireFox), switch to a different workspace. If the system is in the early stages of restoring multiple browser windows (and/or multiple tabs) when switch to workspace is done, then whatever windows / tabs are being restored at that instant will "follow" into the workspace just switched to. So the effect is to spread the multi-window session across multiple workspaces, when they should be restored only in the workspace where restoration was initiated. The three workarounds for this bug that I am aware of are: 1) Don't use more than one workspace (obviously unacceptable), 2) Don't open more than one browser window (also unacceptable), 3) Wait a sufficient amount of time for all windows to be started up in the workspace from which browser restoration started before switching to another workspace. It should be obvious that the more browser windows there are to restore, the easier it is to reproduce this bug, and more time user must wait before switching to another workspace. I often restore browser sessions made up of 20 browser windows or more, so it is quite easy for me to reproduce!