Various commenting improvements (#4938)

* fix: New threads attached to previous as replies

* fix: Cannot use floating toolbar properly in comments

* perf: Avoid re-writing history on click in editor

* fix: Comment on text selection

* fix: 'Copy link' on comments uses wrong hostname

* Show comment buttons on input focus rather than non-empty input
Increase maximum sidebar size

* Allow opening comments from document menu

* fix: Clicking comment menu should not focus thread

shared/styles/theme.ts

@@ -50,7 +50,7 @@ const spacing = {
   sidebarWidth: 260,
   sidebarCollapsedWidth: 16,
   sidebarMinWidth: 200,
-  sidebarMaxWidth: 400,
+  sidebarMaxWidth: 600,
 };
 
 const buildBaseTheme = (input: Partial<Colors>) => {