Stop using alt- shortcuts (#20378)

Closes #7688

Release Notes:

- (breaking change) Stop binding keyboard shortcuts to alt-[a-z]. These
get in the way of typing characters. This is usually not an issue for
English speakers because we don't use many characters; but for other
Latin-based languages with diacritics our shortcuts prevent them typing
what they need to type.

This primarily affects Zed's extra features:
* `alt-q` => `cmd-k q` on maOS, `ctrl-k q` on Linux for `editor::Rewrap`
* `alt-z` => `cmd-k z` on macOS `ctrl-k z` on Linux for
`editor::ToggleSoftWrap`
  * `alt-m` => `ctrl-shift-m` for `assistant::ToggleModelSelector`
* `alt-v` => `ctrl-shift-v` for `["editor::MovePageUp", {
"center_cursor": true }]` (macOS only)
* `alt-t` => `cmd-shift-r` on maOS, `ctrl-shift-r` on Linux for
`task::Spawn` (The previous binding for `editor::RevealInFileManager`
now only applies in the project panel)
* `alt-shift-t` => `alt-cmd-r` on maOS, `ctrl-alt-r` on Linux for
`task::Rerun`
* `alt-shift-f` => `ctrl-shift-f` for
`project_panel::SearchInDirectory`.
 
But also overrides some bindings from Readline.
  * `alt-h` => `alt-backspace` for `editor::DeleteToPreviousWordStart`
  * `alt-d` => `alt-delete` for `editor::DeleteToNextWordEnd`
* `alt-f` => `ctrl-f` for `editor:: MoveToNextWordEnd` (`ctrl-f` was
previously `editor::MoveRight`)
* `alt-b` => `ctrl-b` for `editor::MoveToNextWordStart` (`ctrl-b` was
previously `editor::MoveLeft`)

Note that `alt-t` and `alt-shift-t` have been kept as aliases (because
no-one complained about `t` yet; but we may remove them completely in
the future).

assets/keymaps/default-linux.json

@@ -56,7 +56,8 @@
       "shift-tab": "editor::TabPrev",
       "ctrl-k": "editor::CutToEndOfLine",
       // "ctrl-t": "editor::Transpose",
-      "alt-q": "editor::Rewrap",
+      "ctrl-k ctrl-q": "editor::Rewrap",
+      "ctrl-k q": "editor::Rewrap",
       "ctrl-backspace": "editor::DeleteToPreviousWordStart",
       "ctrl-delete": "editor::DeleteToNextWordEnd",
       "shift-delete": "editor::Cut",
@@ -126,7 +127,8 @@
       "shift-enter": "editor::Newline",
       "ctrl-enter": "editor::NewlineAbove",
       "ctrl-shift-enter": "editor::NewlineBelow",
-      "alt-z": "editor::ToggleSoftWrap",
+      "ctrl-k ctrl-z": "editor::ToggleSoftWrap",
+      "ctrl-k z": "editor::ToggleSoftWrap",
       "ctrl-f": "buffer_search::Deploy",
       "ctrl-h": ["buffer_search::Deploy", { "replace_enabled": true }],
       // "cmd-e": ["buffer_search::Deploy", { "focus": false }],
@@ -169,7 +171,7 @@
       "ctrl-k c": "assistant::CopyCode",
       "ctrl-g": "search::SelectNextMatch",
       "ctrl-shift-g": "search::SelectPrevMatch",
-      "alt-m": "assistant::ToggleModelSelector",
+      "ctrl-shift-m": "assistant::ToggleModelSelector",
       "ctrl-k h": "assistant::DeployHistory",
       "ctrl-k l": "assistant::DeployPromptLibrary",
       "ctrl-n": "assistant::NewContext"
@@ -326,7 +328,6 @@
       "ctrl-k ctrl-j": "editor::UnfoldAll",
       "ctrl-space": "editor::ShowCompletions",
       "ctrl-.": "editor::ToggleCodeActions",
-      "alt-ctrl-r": "editor::RevealInFileManager",
       "ctrl-k r": "editor::RevealInFileManager",
       "ctrl-k p": "editor::CopyPath",
       "ctrl-\\": "pane::SplitRight",
@@ -417,6 +418,8 @@
       "ctrl-k shift-up": ["workspace::SwapPaneInDirection", "Up"],
       "ctrl-k shift-down": ["workspace::SwapPaneInDirection", "Down"],
       "ctrl-shift-x": "zed::Extensions",
+      "ctrl-shift-r": "task::Rerun",
+      "ctrl-alt-r": "task::Rerun",
       "alt-t": "task::Rerun",
       "alt-shift-t": "task::Spawn"
     }
@@ -587,7 +590,7 @@
       "ctrl-delete": ["project_panel::Delete", { "skip_prompt": false }],
       "alt-ctrl-r": "project_panel::RevealInFileManager",
       "ctrl-shift-enter": "project_panel::OpenWithSystem",
-      "alt-shift-f": "project_panel::NewSearchInDirectory",
+      "ctrl-shift-f": "project_panel::NewSearchInDirectory",
       "shift-down": "menu::SelectNext",
       "shift-up": "menu::SelectPrev",
       "escape": "menu::Cancel"