Add an input.insert_mode.auto_enter setting

Closes #3143

doc/changelog.asciidoc

@@ -54,6 +54,10 @@ Added
   * `tabs.mode_on_change` which replaces `tabs.persist_mode_on_change`. It can
     now be set to `restore` which remembers input modes (input/passthrough)
     per tab.
+  * `input.insert_mode.auto_enter` which makes it possible to disable entering
+    insert mode automatically when an editable element was clicked. Together
+    with `input.forward_unbound_keys`, this should allow for emacs-like
+    "modeless" keybindings.
 - New `:prompt-yank` command (bound to `Alt-y` by default) to yank URLs
   referenced in prompts.
 - The `hostblock_blame` script which was removed in v1.0 was updated for the new

doc/help/settings.asciidoc

@@ -201,6 +201,7 @@
 |<<hints.uppercase,hints.uppercase>>|Make characters in hint strings uppercase.
 |<<history_gap_interval,history_gap_interval>>|Maximum time (in minutes) between two history items for them to be considered being from the same browsing session.
 |<<input.forward_unbound_keys,input.forward_unbound_keys>>|Which unbound keys to forward to the webview in normal mode.
+|<<input.insert_mode.auto_enter,input.insert_mode.auto_enter>>|Enter insert mode if an editable element is clicked.
 |<<input.insert_mode.auto_leave,input.insert_mode.auto_leave>>|Leave insert mode if a non-editable element is clicked.
 |<<input.insert_mode.auto_load,input.insert_mode.auto_load>>|Automatically enter insert mode if an editable element is focused after loading the page.
 |<<input.insert_mode.plugins,input.insert_mode.plugins>>|Switch to insert mode when clicking flash and other plugins.
@@ -2400,6 +2401,14 @@ Valid values:
 
 Default: +pass:[auto]+
 
+[[input.insert_mode.auto_enter]]
+=== input.insert_mode.auto_enter
+Enter insert mode if an editable element is clicked.
+
+Type: <<types,Bool>>
+
+Default: +pass:[true]+
+
 [[input.insert_mode.auto_leave]]
 === input.insert_mode.auto_leave
 Leave insert mode if a non-editable element is clicked.

qutebrowser/browser/mouse.py

@@ -151,8 +151,9 @@ class MouseEventFilter(QObject):
 
         if elem.is_editable():
             log.mouse.debug("Clicked editable element!")
-            modeman.enter(self._tab.win_id, usertypes.KeyMode.insert,
+            if config.val.input.insert_mode.auto_enter:
-                          'click', only_if_normal=True)
+                modeman.enter(self._tab.win_id, usertypes.KeyMode.insert,
+                              'click', only_if_normal=True)
         else:
             log.mouse.debug("Clicked non-editable element!")
             if config.val.input.insert_mode.auto_leave:

qutebrowser/browser/webelem.py

@@ -411,8 +411,9 @@ class AbstractWebElement(collections.abc.MutableMapping):
             elif self.is_editable(strict=True):
                 log.webelem.debug("Clicking via JS focus()")
                 self._click_editable(click_target)
-                modeman.enter(self._tab.win_id, usertypes.KeyMode.insert,
+                if config.val.input.insert_mode.auto_enter:
-                              'clicking input')
+                    modeman.enter(self._tab.win_id, usertypes.KeyMode.insert,
+                                  'clicking input')
             else:
                 self._click_fake_event(click_target)
         elif click_target in [usertypes.ClickTarget.tab,

qutebrowser/config/configdata.yml

@@ -981,6 +981,11 @@ input.insert_mode.auto_load:
   desc: Automatically enter insert mode if an editable element is focused after
     loading the page.
 
+input.insert_mode.auto_enter:
+  default: true
+  type: Bool
+  desc: Enter insert mode if an editable element is clicked.
+
 input.insert_mode.auto_leave:
   default: true
   type: Bool