vim: add support for insert-btn

This commit adds support for using the physical insert-btn. First
click toggles insert mode and subsequent clicks toggle back and
forth between replace and insert mode.

assets/keymaps/vim.json

@@ -252,6 +252,7 @@
       "@": ["vim::PushOperator", "ReplayRegister"],
       "ctrl-pagedown": "pane::ActivateNextItem",
       "ctrl-pageup": "pane::ActivatePrevItem",
+      "insert": "vim::InsertBefore",
       // tree-sitter related commands
       "[ x": "editor::SelectLargerSyntaxNode",
       "] x": "editor::SelectSmallerSyntaxNode",
@@ -334,7 +335,8 @@
       "ctrl-t": "vim::Indent",
       "ctrl-d": "vim::Outdent",
       "ctrl-k": ["vim::PushOperator", { "Digraph": {} }],
-      "ctrl-r": ["vim::PushOperator", "Register"]
+      "ctrl-r": ["vim::PushOperator", "Register"],
+      "insert": "vim::ToggleReplace"
     }
   },
   {
@@ -353,7 +355,8 @@
       "ctrl-k": ["vim::PushOperator", { "Digraph": {} }],
       "backspace": "vim::UndoReplace",
       "tab": "vim::Tab",
-      "enter": "vim::Enter"
+      "enter": "vim::Enter",
+      "insert": "vim::InsertBefore"
     }
   },
   {

crates/vim/src/vim.rs

@@ -399,7 +399,6 @@ impl Vim {
             operator,
             Operator::Change
                 | Operator::Delete
-                | Operator::Replace
                 | Operator::Indent
                 | Operator::Outdent
                 | Operator::Lowercase
@@ -409,6 +408,16 @@ impl Vim {
         ) {
             self.start_recording(cx)
         };
+
+        if matches!(operator, Operator::Replace) {
+            // Switch to normal mode when replacing from insert mode.
+            if matches!(self.mode, Mode::Insert) {
+                self.switch_mode(Mode::Normal, true, cx);
+            }
+
+            self.start_recording(cx);
+        }
+
         // Since these operations can only be entered with pre-operators,
         // we need to clear the previous operators when pushing,
         // so that the current stack is the most correct