Fix cursor jumping bug in tree and comment renaming

CHANGELOG.unreleased.md

@@ -24,6 +24,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.released
 ### Fixed
 - Fixed that some segment (group) actions were not properly disabled for non-editable segmentation layers. [#7207](https://github.com/scalableminds/webknossos/issues/7207)
 - Fixed a bug where data from zarr2 datasets that have a channel axis was broken. [#7374](https://github.com/scalableminds/webknossos/pull/7374)
+- Fixed a bug which changed the cursor position while editing the name of a tree or the comment of a node. [#7390](#https://github.com/scalableminds/webknossos/pull/7390)
 
 ### Removed
 

frontend/javascripts/oxalis/view/components/input_component.tsx

@@ -2,14 +2,22 @@ import { Input, InputProps, InputRef, Tooltip } from "antd";
 import * as React from "react";
 import _ from "lodash";
 
+type InputComponentState = {
+  currentValue: React.InputHTMLAttributes<HTMLInputElement>["value"];
+};
+
 /*
- * A lightweight wrapper around <Input> which does:
- * - automatically blur on Escape
- * - maintain the cursor position / selection even when mutating the input value
+ * A lightweight wrapper around <Input> which:
+ * - automatically blurs on Escape
+ * - fixes cursor-jumping bugs by keeping a local copy of the input's value
+ *   within state.currentValue. Without it, editing the name of trees or
+ *   comments would always move the cursor to the input's end after each key press.
+ *   The fix is inspired by https://github.com/facebook/react/issues/955#issuecomment-281802381
+ * - maintains the cursor position / selection even when mutating the input value
  *   while it's focused (mainly necessary when mutating the value on arrow-keypresses)
  */
 
-class InputComponent extends React.PureComponent<InputProps, {}> {
+class InputComponent extends React.PureComponent<InputProps, InputComponentState> {
   inputRef = React.createRef<InputRef>();
   static defaultProps: InputProps = {
     onChange: _.noop,
@@ -18,6 +26,10 @@ class InputComponent extends React.PureComponent<InputProps, {}> {
     style: {},
   };
 
+  state = {
+    currentValue: this.props.value,
+  };
+
   getSnapshotBeforeUpdate(_prevProps: InputProps, _prevState: {}): [number | null, number | null] {
     // Remember the selection within the input before updating it.
     try {
@@ -33,10 +45,16 @@ class InputComponent extends React.PureComponent<InputProps, {}> {
   }
 
   componentDidUpdate(
-    _prevProps: InputProps,
+    prevProps: InputProps,
     _prevState: {},
     snapshot: [number | null, number | null],
   ) {
+    if (prevProps.value !== this.props.value) {
+      this.setState({
+        currentValue: this.props.value,
+      });
+    }
+
     // Restore the remembered selection when necessary
     try {
       // @ts-ignore
@@ -47,32 +65,24 @@ class InputComponent extends React.PureComponent<InputProps, {}> {
   }
 
   handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    this.setState({
+      currentValue: e.target.value,
+    });
     if (this.props.onChange) {
       this.props.onChange(e);
     }
   };
 
   handleFocus = (e: React.FocusEvent<HTMLInputElement>) => {
-    this.setState({
-      isFocused: true,
-    });
-
     if (this.props.onFocus) {
       this.props.onFocus(e);
     }
   };
 
   handleBlur = (e: React.FocusEvent<HTMLInputElement>) => {
-    this.setState(
-      {
-        isFocused: false,
-      },
-      () => {
-        if (this.props.onBlur) {
-          this.props.onBlur(e);
-        }
-      },
-    );
+    if (this.props.onBlur) {
+      this.props.onBlur(e);
+    }
   };
 
   blurYourself = () =>
@@ -98,7 +108,7 @@ class InputComponent extends React.PureComponent<InputProps, {}> {
         onChange={this.handleChange}
         onFocus={this.handleFocus}
         onBlur={this.handleBlur}
-        value={this.props.value}
+        value={this.state.currentValue}
         onKeyDown={this.blurOnEscape}
       />
     );