options: disable --input-ime by default

Enabling IME by default can cause problems when the player is
expecting keybinds and not text input. Windows IME implementation
mitigates this by switching IME to alphanumeric mode,
but this is impossible on Wayland with the text input protocol.

Disable it by default and add a note to recommend enabling IME only on
demand, like console.lua.

DOCS/interface-changes/input.txt

@@ -1 +1,2 @@
 add `--input-ime` to enable or disable the IME on supported VOs (Windows, Wayland)
+disable IME by default; set `--input-ime=yes` to enable it on demand

DOCS/man/options.rst

@@ -4496,7 +4496,7 @@ Input
 
 ``--input-ime=<yes|no>``
     Enable keyboard input via an active input method (IME) connected to the VO.
-    (default: yes). The input popup window, if there is any, is always
+    (default: no). The input popup window, if there is any, is always
     positioned at the top left of the window. Whether pre-edit text is drawn
     depends on the platform. You may need to configure your IME to display the
     pre-edit inside of the input popup window if you cannot read the pre-edit
@@ -4504,6 +4504,16 @@ Input
 
     Wayland and Windows only. This option is not applicable to terminal input.
 
+    .. note::
+
+        Enabling IME can cause problems with key bindings, because mpv cannot
+        detect any key presses when they go into the IME pre-edit area.
+        It is recommended to enable IME on demand only for the duration
+        while text input is expected.
+
+        The builtin console and input selector enable IME for the duration
+        of accepting text input.
+
 OSD
 ---
 

options/options.c

@@ -261,7 +261,6 @@ const struct m_sub_options vo_sub_opts = {
         .keepaspect = true,
         .keepaspect_window = true,
         .native_fs = true,
-        .input_ime = true,
         .taskbar_progress = true,
         .show_in_taskbar = true,
         .border = true,