cleanup a bunch of internal runtime logic (#10446)

packages/svelte/src/internal/client/runtime.js

@@ -1091,7 +1091,7 @@ export function mark_subtree_inert(signal, inert, visited_blocks = new Set()) {
 			if (type === IF_BLOCK) {
 				const condition_effect = block.e;
 				if (condition_effect !== null && block !== current_block) {
-					mark_subtree_inert(condition_effect, inert);
+					mark_subtree_inert(condition_effect, inert, visited_blocks);
 				}
 				const consequent_effect = block.ce;
 				if (consequent_effect !== null && block.v) {

packages/svelte/src/internal/client/transitions.js

@@ -649,12 +649,16 @@ export function trigger_transitions(transitions, target_direction, from) {
 			mark_subtree_inert(effect, false);
 		} else if (target_direction === 'key') {
 			if (direction === 'key') {
-				transition.p = transition.i(/** @type {DOMRect} */ (from));
+				if (!transition.p) {
+					transition.p = transition.i(/** @type {DOMRect} */ (from));
+				}
 				transition.in();
 			}
 		} else {
 			if (direction === 'out' || direction === 'both') {
-				transition.p = transition.i();
+				if (!transition.p) {
+					transition.p = transition.i();
+				}
 				outros.push(transition.o);
 			}
 			transition.d.inert = true;

packages/svelte/tests/runtime-legacy/samples/transition-js-if-block-bidi/_config.js

@@ -17,7 +17,7 @@ export default test({
 
 		component.visible = false;
 		// @ts-expect-error
-		assert.equal(global.count, 2);
+		assert.equal(global.count, 1);
 
 		raf.tick(500);
 		assert.equal(div.foo, 0.25);