#1247 Fix grid filter in network latency conditions when using blazor server

[OriginalSkain]

Fix Grid Filter Typing Experience (Character Loss)

Summary

This PR addresses an issue where characters were being lost when typing quickly into the Grid column filters. The manual @oninput event handling caused re-renders that interfered with the input state, particularly during rapid typing.

This change replaces the manual event handling with Blazor's two-way @bind-value binding, which correctly manages the input state and cursor position during updates.

Changes

GridColumnFilter.razor

• Replaced manual value="@filterValue" @oninput="..." binding with @bind-value="filterValue" @bind-value:event="oninput" for:
  • Text inputs (String, Guid)
  • Number inputs (Int16, Int32, Int64, Single, Decimal, Double)
  • Checkbox inputs (Boolean - using @onchange)
• Retained manual handling for Date and DateTime inputs due to Blazor type conversion limitations, but optimized the handler (OnFilterValueInput) to minimize impact.

GridColumnFilter.razor.cs

• Converted the filterValue field to a property with a setter.
• The setter now automatically triggers the GridColumnFilterChanged event when the value changes, ensuring consistent behavior with the two-way binding.
• Removed the obsolete OnFilterValueChangedAsync method.
• Updated OnEnumFilterValueChangedAsync and OnFilterOperatorChangedAsync to prevent duplicate event firing.

Problem Addressed

Previously, the manual @oninput handler triggered a re-render on every keystroke. If the user typed another character before the re-render completed, the input value in the DOM could be overwritten by the old state from the server/wasm, causing the new character to be lost or the cursor to jump.

By switching to @bind-value, Blazor's internal diffing mechanism handles the input state more intelligently, preserving the user's input and cursor position.

Related Issues

• Addresses known Blazor pattern issues documented in:
  • dotnet/aspnetcore#8204
  • dotnet/aspnetcore#14242

Verification

1. Open a Grid with filterable columns.
2. Type quickly into a Text or Number filter column.
   • Expected: All characters appear correctly, cursor does not jump.
3. Type into a Date or DateTime filter.
   • Expected: Input works correctly and filtering is applied.
4. Use a Boolean (checkbox) filter or Enum dropdown.
   • Expected: Filtering is applied correctly.