fix(Editor): Trigger gotoLine only when change is from sidebar

[mdziekon]

Description

• Fixes jarring editor experience as described in New config files editor exhibits jarring experience when navigating through code #2011
  • It uses a flag to indicate when sidebar item activation originates from the sidebar itself, or somewhere else, by detecting the sidebar's item click. Not a perfect solution, but generally works, although it does leave a bit of a dead click zone when user clicks on very boundaries of sidebar's item. Still better than previous behavior.
  • Once Mainsail upgrades to Vuetify v3, this can be solved a bit easier & cleaner using click:open event handler of the Treeview component, see https://vuetifyjs.com/en/api/v-treeview/#events-click:open
• Fixes JS error being thrown when sidebar item is deactivated by "unclicking" the item
  • Also, slightly improves TS typings for activeChanges, although due to this.editor being typed as any, this is just cosmetics and maybe slightly better code documentation experience

Related Tickets & Documents

#2011

Mobile & Desktop Screenshots/Recordings

Before

editor_before.webm

After

editor_after.webm

[meteyou]

Thank you very much for finding and fixing this issue before we released it!