fix(input-number): correct wip value computing

CHANGELOG.en-US.md

@@ -7,7 +7,7 @@
 ### Fixes
 
 - Fix `n-time-picker`'s `use-12-hours` type error warning, closes [#4308](https://github.com/tusen-ai/naive-ui/issues/4308)
-- Fix `input-number` the problem that the negative sign is replaced when the negative sign is entered
+- Fix `input-number` the problem that the negative sign is replaced when the negative sign is entered.
 - Fix `n-data-table`'s header will show scrollbar in some old browsers, closes [#6557](https://github.com/tusen-ai/naive-ui/issues/6557).
 
 ### Features

src/input-number/src/utils.ts

@@ -11,13 +11,17 @@ export function parse(value: string): number | null {
   return Number(value)
 }
 
-// can be parsed to number but shouldn't be applied when inputing
-// when value includes `.`, ending with 0 and`.`, doesn't update, if 0 parse func will remove 0
-// allow negative sign
+// This function is created for `update-value-on-input` prop. When the prop is
+// true, the input value will update the value and <input />'s value at the same
+// time. So we need to make user's content won't be replaced by its parsed value
+// in some certain cases. For example '0.' should be parsed and replaced by '0',
+// '-0' should be parsed and replaced by '0', since user may input '-0.1' after.
 export function isWipValue(value: string): boolean {
   return (
-    (value.includes('.') && /^-?\d*\.?\d*$/.test(value))
-    || /^-?\d*$/.test(value)
+    (value.includes('.')
+      && (/^(-)?\d+.*(\.|0)$/.test(value) || /^(-)?\.\d+$/.test(value)))
+      || value === '-'
+      || value === '-0'
   )
 }