fix: when onResizeStart return false it should stop (#978)

- when `onResizeStart` returns `false`, for example when editor `commitCurrentEdit()` fails, then the column resize shouldn't be allowed

examples/example4-model-esm.html

@@ -222,7 +222,9 @@ <h2>View Source:</h2>
 
 function requiredFieldValidator(value) {
   if (value == null || value == undefined || !value.length) {
-    return {valid: false, msg: "This is a required field"};
+    return {valid: false, msg: 'This is a required field'};
+  } else if (!/^(task\s\d+)*$/i.test(value)) {
+    return { valid: false, msg: 'Your title is invalid, it must start with "Task" followed by a number.' };
   }
   else {
     return {valid: true, msg: null};

src/slick.interactions.ts

@@ -231,18 +231,20 @@ export function Resizable(options: ResizableOption) {
 
   function executeResizeCallbackWhenDefined(callback?: Function, e?: MouseEvent | TouchEvent | Touch) {
     if (typeof callback === 'function') {
-      callback(e, { resizeableElement, resizeableHandleElement });
+      return callback(e, { resizeableElement, resizeableHandleElement });
     }
   }
 
   function resizeStartHandler(e: MouseEvent | TouchEvent) {
     e.preventDefault();
     const event = (e as TouchEvent).touches ? (e as TouchEvent).changedTouches[0] : e;
-    executeResizeCallbackWhenDefined(onResizeStart, event);
-    document.body.addEventListener('mousemove', resizingHandler);
-    document.body.addEventListener('mouseup', resizeEndHandler);
-    document.body.addEventListener('touchmove', resizingHandler);
-    document.body.addEventListener('touchend', resizeEndHandler);
+    const result = executeResizeCallbackWhenDefined(onResizeStart, event);
+    if (result !== false) {
+      document.body.addEventListener('mousemove', resizingHandler);
+      document.body.addEventListener('mouseup', resizeEndHandler);
+      document.body.addEventListener('touchmove', resizingHandler);
+      document.body.addEventListener('touchend', resizeEndHandler);
+    }
   }
 
   function resizingHandler(e: MouseEvent | TouchEvent) {