fix: stuck flashes (#308)

removed the timeout clear, because it would overwrite currently active
timeouts, leading to stuck flash highlights. without clearing, the worst
thing that can happen is that you evaluate twice within 150 ms and get a
slightly shorter flash

fixes #296

packages/cm-eval/lib/flashField.ts

@@ -3,8 +3,6 @@ import { StateField, StateEffect } from "@codemirror/state";
 
 type FlashRange = [number, number];
 
-let timeoutId: any;
-
 export const setFlash = StateEffect.define<FlashRange | null>();
 
 const defaultStyle = {
@@ -23,9 +21,8 @@ export const flash = (
   timeout: number = 150
 ) => {
   if (from === null || to === null) return;
-  clearTimeout(timeoutId);
   view.dispatch({ effects: setFlash.of([from, to]) });
-  timeoutId = setTimeout(() => {
+  setTimeout(() => {
     view.dispatch({ effects: setFlash.of(null) });
   }, timeout);
 };