Reduce display_map snapshot creation (#39354)

Re-applies https://github.com/zed-industries/zed/pull/30840

This PR re-applies the initial
[PR](https://github.com/zed-industries/zed/pull/30840). As it was closed
because it was hard to land, because of the many conflicts. This PR
re-applies the changes for it.

In several cases we were creating multiple display_map
snapshots within the same root-level function call.
Creating a display_map snapshot is quite slow, and in some
cases we were creating the snapshot multiple times.

Release Notes:

- N/A

crates/vim/src/normal/paste.rs

@@ -56,7 +56,8 @@ impl Vim {
                     vim.copy_selections_content(editor, MotionKind::for_mode(vim.mode), window, cx);
                 }
 
-                let (display_map, current_selections) = editor.selections.all_adjusted_display(cx);
+                let display_map = editor.display_snapshot(cx);
+                let current_selections = editor.selections.all_adjusted_display(&display_map);
 
                 // unlike zed, if you have a multi-cursor selection from vim block mode,
                 // pasting it will paste it on subsequent lines, even if you don't yet
@@ -173,7 +174,7 @@ impl Vim {
                     original_indent_columns.push(original_indent_column);
                 }
 
-                let cursor_offset = editor.selections.last::<usize>(cx).head();
+                let cursor_offset = editor.selections.last::<usize>(&display_map).head();
                 if editor
                     .buffer()
                     .read(cx)