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Fix two panes being closed when just one is (#17358)
#17333 introduced a regression: While it fixes a recursion *into* `Pane::Close()` that doesn't fix the recursion outside of it. In this case, `Close()` raises the `Closed` event which results in another tab being closed because it's bound to `_RemoveTab`. The recursion is now obvious, because I made the entire process synchronous. Previously, it would (hopefully) just be scheduled after the pane and its content are already gone. The issue can be fixed by moving the recursion check from `Pane::Close()` to `TerminalTab::Shutdown()` but I felt like it would better to fix the issue a bit more thoroughly. `IPaneContent` can raise a `CloseRequested` event to indicate it wants to be closed. However, that also contained recursion, because the content would call its own `Close()` to raise the event, which the tab catches, calls `Close()` on the `Pane` which calls `Close()` on the content which raises the event again and so on. That's what was fixed in #17333 among others. We can do this better by not raising the event from `IPaneContent::Close()`. Instead, that method will now be exclusively called by `Pane`. The `CloseRequested` event will now truly be just a request and nothing more. Furthermore, the ownership of the event handling was moved from the `TerminalTab` to the `Pane`. To make all of this a bit simpler and more robust, two new methods were added to `Pane`: `_takePaneContent` and `_setPaneContent`. These methods ensure that `Close()` is called on the content, that the event handlers are always added and revoked and that the ownership transfers cleanly between panes. ## Validation Steps Performed * Open 3 tabs, close the middle one ✅ * Open 3 vertical panes, close the middle one ✅ * Drag tabs with multiple panes between windows ✅
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