VS code dialogs do not appear in foreground (cinnamon)

That is a common bug in electron applications when they are using GTK (see here and here).

Add to your .bashrc the line:

export GTK_USE_PORTAL=1  

Then edit the menu of the operating system as follows:

• Right click on the menu
• Select configure
• Open the menu editor
• Select the application
• Click properties
• Add the following:

env GTK_USE_PORTAL=1 /usr/share/code/code --unity-launch %F

Screenshots: