[8.18] [kbn-grid-layout] Disable pointer events on drag + resize (#20…

…8647) (#209422)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[kbn-grid-layout] Disable pointer events on drag + resize
(#208647)](#208647)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Disable pointer events on drag + resize (#208647)\n\n##
Summary\r\n\r\nThis PR greatly improves the performance of
`kbn-grid-layout` on drag +\r\nresize by disabling pointer events during
these actions. This is\r\nespecially evident when dragging over panels
that have their own mouse\r\nevent listeners.\r\n\r\n| Before | After
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Disable pointer events on drag +
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Disable pointer events on drag + resize (#208647)\n\n##
Summary\r\n\r\nThis PR greatly improves the performance of
`kbn-grid-layout` on drag +\r\nresize by disabling pointer events during
these actions. This is\r\nespecially evident when dragging over panels
that have their own mouse\r\nevent listeners.\r\n\r\n| Before | After
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Disable pointer events on drag + resize (#208647)\n\n##
Summary\r\n\r\nThis PR greatly improves the performance of
`kbn-grid-layout` on drag +\r\nresize by disabling pointer events during
these actions. This is\r\nespecially evident when dragging over panels
that have their own mouse\r\nevent listeners.\r\n\r\n| Before | After
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BACKPORT-->

Co-authored-by: Hannah Mudge <Heenawter@users.noreply.github.com>

src/platform/packages/private/kbn-grid-layout/grid/grid_height_smoother.tsx

@@ -33,14 +33,11 @@ export const GridHeightSmoother = ({
 
       if (!interactionEvent) {
         smoothHeightRef.current.style.minHeight = `${dimensions.height}px`;
-        smoothHeightRef.current.style.userSelect = 'auto';
         return;
       }
-
       smoothHeightRef.current.style.minHeight = `${
         smoothHeightRef.current.getBoundingClientRect().height
       }px`;
-      smoothHeightRef.current.style.userSelect = 'none';
     });
 
     return () => {

src/platform/packages/private/kbn-grid-layout/grid/grid_layout.tsx

@@ -161,6 +161,12 @@ export const GridLayout = ({
         css={css`
           padding: calc(var(--kbnGridGutterSize) * 1px);
 
+          // disable pointer events and user select on drag + resize
+          &:has(.kbnGridPanel--active) {
+            user-select: none;
+            pointer-events: none;
+          }
+
           &:has(.kbnGridPanel--expanded) {
             ${expandedPanelStyles}
           }