Merge pull request #15569 from jpmBBconsult/fix/left-prefix-input-num…

…ber-selection

#15293 fixed inputNumber selection lost when selecting left prefix

src/app/components/inputnumber/inputnumber.ts

@@ -1181,14 +1181,23 @@ export class InputNumber implements OnInit, AfterContentInit, OnChanges, Control
 
     initCursor() {
         let selectionStart = this.input?.nativeElement.selectionStart;
+        let selectionEnd = this.input?.nativeElement.selectionEnd;
         let inputValue = this.input?.nativeElement.value;
         let valueLength = inputValue.length;
         let index = null;
 
         // remove prefix
         let prefixLength = (this.prefixChar || '').length;
         inputValue = inputValue.replace(this._prefix, '');
-        selectionStart = selectionStart - prefixLength;
+
+        // Will allow selecting whole prefix. But not a part of it.
+        // Negative values will trigger clauses after this to fix the cursor position.
+        if (selectionStart === selectionEnd
+            || selectionStart !== 0 
+            || selectionEnd < prefixLength)
+        {
+            selectionStart -= prefixLength;
+        }
 
         let char = inputValue.charAt(selectionStart);
         if (this.isNumeralChar(char)) {