Props in svelte:component are not properly updated when there are spread props

[konstantinov90]

Describe the bug

A bug was introduced In #9006

in svelte:component when there are spread props, other non spread props are lost altogether after single update

Reproduction

see
https://svelte.dev/repl/23ef1cbbb7c4485fabdba130ee49e08a?version=4.1.0 - here spread props are not updated
https://svelte.dev/repl/23ef1cbbb7c4485fabdba130ee49e08a?version=4.1.1 - here spread props ARE updated, but other non-spread props are lost altogether
https://svelte.dev/repl/23ef1cbbb7c4485fabdba130ee49e08a?version=4.2.11 - bug still reproduces

Logs

No response

System Info

System:
    OS: macOS 14.2.1
    CPU: (8) arm64 Apple M1
    Memory: 102.66 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.11.0 - /usr/local/bin/node
    Yarn: 1.22.17 - /opt/homebrew/bin/yarn
    npm: 8.4.1 - /opt/homebrew/bin/npm
    pnpm: 7.9.5 - /opt/homebrew/bin/pnpm
    bun: 1.0.0 - ~/.bun/bin/bun
  Browsers:
    Brave Browser: 121.1.62.165
    Chrome: 113.0.5672.92
    Safari: 17.2.1

Severity

blocking an upgrade

[konstantinov90]

possible fix

diff --git a/node_modules/svelte/src/compiler/compile/render_dom/wrappers/InlineComponent/index.js b/node_modules/svelte/src/compiler/compile/render_dom/wrappers/InlineComponent/index.js
index d5cf834..e29050b 100644
--- a/node_modules/svelte/src/compiler/compile/render_dom/wrappers/InlineComponent/index.js
+++ b/node_modules/svelte/src/compiler/compile/render_dom/wrappers/InlineComponent/index.js
@@ -277,14 +277,13 @@ export default class InlineComponentWrapper extends Wrapper {
 						// statements will become switch_props function body
 						// rewrite last statement, add props update logic
 						statements[statements.length - 1] = b`
+							for (let #i = 0; #i < ${levels}.length; #i += 1) {
+								${props} = @assign(${props}, ${levels}[#i]);
+							}
 							if (#dirty !== undefined && ${condition}) {
-								${props} = @get_spread_update(${levels}, [
+								${props} = @assign(${props}, @get_spread_update(${levels}, [
 									${changes}
-								]);
-							} else {
-								for (let #i = 0; #i < ${levels}.length; #i += 1) {
-									${props} = @assign(${props}, ${levels}[#i]);
-								}
+								]));
 							}
 						`;
 					}

[dummdidumm]

PR welcome!

[konstantinov90]

PR #10604

[konstantinov90]

how do i do a svelte-4 fix?