Make word deletions less greedy (#37352)

Closes https://github.com/zed-industries/zed/issues/37144

Adjusts `editor::DeleteToPreviousWordStart`,
`editor::DeleteToNextWordEnd`, `editor::DeleteToNextSubwordEnd` and
`editor::DeleteToPreviousSubwordStart` actions to

* take whitespace sequences with length >= 2 into account and stop after
removing them (whilst movement would also include the word after such
sequences)

* take current language's brackets into account and stop after removing
the text before them

The latter is configurable and can be disabled with `"ignore_brackets":
true` parameter in the action.

Release Notes:

- Improved word deletions to consider whitespace sequences and brackets
by default

assets/keymaps/linux/emacs.json

@@ -42,7 +42,7 @@
       "alt-,": "pane::GoBack", // xref-pop-marker-stack
       "ctrl-x h": "editor::SelectAll", // mark-whole-buffer
       "ctrl-d": "editor::Delete", // delete-char
-      "alt-d": "editor::DeleteToNextWordEnd", // kill-word
+      "alt-d": ["editor::DeleteToNextWordEnd", { "ignore_newlines": false, "ignore_brackets": false }], // kill-word
       "ctrl-k": "editor::KillRingCut", // kill-line
       "ctrl-w": "editor::Cut", // kill-region
       "alt-w": "editor::Copy", // kill-ring-save

assets/keymaps/linux/sublime_text.json

@@ -50,8 +50,8 @@
       "ctrl-k ctrl-u": "editor::ConvertToUpperCase",
       "ctrl-k ctrl-l": "editor::ConvertToLowerCase",
       "shift-alt-m": "markdown::OpenPreviewToTheSide",
-      "ctrl-backspace": "editor::DeleteToPreviousWordStart",
-      "ctrl-delete": "editor::DeleteToNextWordEnd",
+      "ctrl-backspace": ["editor::DeleteToPreviousWordStart", { "ignore_newlines": false, "ignore_brackets": false }],
+      "ctrl-delete": ["editor::DeleteToNextWordEnd", { "ignore_newlines": false, "ignore_brackets": false }],
       "alt-right": "editor::MoveToNextSubwordEnd",
       "alt-left": "editor::MoveToPreviousSubwordStart",
       "alt-shift-right": "editor::SelectToNextSubwordEnd",