Modify precision to work for -1 value

Author: abigailalexander

src/ui/widgets/Input/input.tsx

@@ -91,7 +91,10 @@ export const SmartInputComponent = (
 
   // Decide what to display.
   const display = value?.getDisplay();
-  const prec = precisionFromPv ? (display?.precision ?? precision) : precision;
+  // In Phoebus, default precision -1 seems to usually be 3. The toFixed functions
+  // cannot accept -1 as a valid answer
+  let prec = precisionFromPv ? (display?.precision ?? precision) : precision;
+  if (prec === -1) prec = 3;
 
   let displayedValue;
   if (!value) {

src/ui/widgets/ProgressBar/progressBar.tsx

@@ -68,7 +68,7 @@ export const ProgressBarComponent = (
       label = "Check min and max values";
     } else {
       if (precision) {
-        label = numValue.toFixed(precision);
+        label = numValue.toFixed(precision === -1 ? 3 : precision);
       } else {
         label = numValue.toString();
       }

src/ui/widgets/Readback/readback.tsx

@@ -99,7 +99,10 @@ export const ReadbackComponent = (
 
   // Decide what to display.
   const display = value?.getDisplay();
-  const prec = precisionFromPv ? (display?.precision ?? precision) : precision;
+  // In Phoebus, default precision -1 seems to usually be 3. The toFixed functions
+  // cannot accept -1 as a valid answer
+  let prec = precisionFromPv ? (display?.precision ?? precision) : precision;
+  if (prec === -1) prec = 3;
 
   let displayedValue;
   if (!value) {