Implement caret cursor switch (#3714, webengine)

Issue https://github.com/qutebrowser/qutebrowser/issues/3714

Only for WebEngine, not for WebKit.

Changes to be committed:
      modified:   qutebrowser/browser/browsertab.py
        Add "reverse_selection" to AbstractTab
      modified:   qutebrowser/browser/webengine/webenginetab.py
        Implement "reverse_selection" in WebEngineTab
      modified:   qutebrowser/components/caretcommands.py
        Register "reverse-selection" command
      modified:   qutebrowser/config/configdata.yml
        Bind "reverse-selection" to o
      modified:   qutebrowser/javascript/caret.js
        Write "reverseSelection" function

1 files changed, 8 insertions, 0 deletions

diff --git a/qutebrowser/javascript/caret.js b/qutebrowser/javascript/caret.js
index 5e6640311..3dfc18e82 100644
--- a/qutebrowser/javascript/caret.js
+++ b/qutebrowser/javascript/caret.js
@@ -1404,5 +1404,13 @@ window._qutebrowser.caret = (function() {
         return CaretBrowsing.selectionEnabled;
     };
 
+    funcs.reverseSelection = () => {
+        let sel = window.getSelection();
+        sel.setBaseAndExtent(
+            sel.extentNode, sel.extentOffset, sel.baseNode,
+            sel.baseOffset
+        );
+    }
+
     return funcs;
 })();