Re-add to deleteContentBackward handler in input event handler

Author: RasPython3

index.html

@@ -2251,24 +2251,28 @@ <h3>設定</h3>
         });
         document.getElementById("cursor").children[1].addEventListener("beforeinput", (e)=>{
           if (e.inputType == "deleteContentBackward") {
-            let i = 0;
-            let count = ((range)=>range.endOffset-range.startOffset)(e.getTargetRanges()[0]);
-            while (count > 0) {
-              count -= texts[cursor_pos[0]][cursor_pos[1] - i].length;
-              i++;
-            }
-            let ev = new KeyboardEvent("keydown", {key: "Backspace", isComposing: false});
-            while (i > 0) {
-              e.target.dispatchEvent(ev);
-              i--;
-            }
-            e.preventDefault();
+            var beforeDeletionLength = e.target.value.length;
           }
+          console.log(e);
         });
         document.getElementById("cursor").children[1].addEventListener("input", (e)=>{
           console.log(e.type, e);
           //console.log(document.getElementById("cursor").children[1].selectionStart, document.getElementById("cursor").children[1].selectionEnd);
           if (e.data == null || e.data == undefined) {
+            if (e.inputType == "deleteContentBackward") {
+              let i = 0;
+              let count = beforeDeletionLength ? beforeDeletionLength - e.target.value.length : 0;
+              while (count > 0) {
+                count -= texts[cursor_pos[0]][cursor_pos[1] - i].length;
+                i++;
+              }
+              let ev = new KeyboardEvent("keydown", {key: "Backspace", isComposing: false});
+              while (i > 0) {
+                e.target.dispatchEvent(ev);
+                i--;
+              }
+              e.preventDefault();
+            }
             return;
           }
           if (composing) {