From ef918790caa86b2871ae11f40803c48acf733caf Mon Sep 17 00:00:00 2001
From: Peter VandeHaar <pjvandehaar@gmail.com>
Date: Wed, 20 Oct 2021 16:30:40 -0400
Subject: [PATCH] Add keybinding meta-backspace to delete to beginning of line

---
 src/static/js/ace2_inner.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/static/js/ace2_inner.js b/src/static/js/ace2_inner.js
index 785473df7..a8b98ac16 100644
--- a/src/static/js/ace2_inner.js
+++ b/src/static/js/ace2_inner.js
@@ -2433,7 +2433,11 @@ function Ace2Inner(editorInfo, cssManagers) {
         const lineEntry = rep.lines.atIndex(lineNum);
         const lineText = lineEntry.text;
         const lineMarker = lineEntry.lineMarker;
-        if (/^ +$/.exec(lineText.substring(lineMarker, col))) {
+        if (evt.metaKey && col > lineMarker) {
+          // cmd-backspace deletes to start of line (if not already at start)
+          performDocumentReplaceRange([lineNum, lineMarker], [lineNum, col], '');
+          handled = true;
+        } else if (/^ +$/.exec(lineText.substring(lineMarker, col))) {
           const col2 = col - lineMarker;
           const tabSize = THE_TAB.length;
           const toDelete = ((col2 - 1) % tabSize) + 1;