This commit addresses a race condition where, with "Auto-Unload Old Models" enabled, rapidly attempting to load multiple models could result in more than one model being loaded simultaneously.
Previously, the unloading logic did not account for models that were still in the process of loading when a new load operation was initiated. This allowed new models to start loading before the previous ones had fully completed their unload cycle.
To resolve this:
- A `loadingModels` map has been introduced to track promises for models currently in the loading state.
- The `load` method now checks if a model is already being loaded and, if so, returns the existing promise, preventing duplicate load operations for the same model.
- The `performLoad` method (which encapsulates the actual loading logic) now ensures that when `autoUnload` is active, it waits for any *other* models that are concurrently loading to finish before proceeding to unload all currently loaded models. This guarantees that the auto-unload mechanism properly unloads all models, including those initiated in quick succession, thereby preventing the race condition.
This fixes the issue where clicking the start button very fast on multiple models would bypass the auto-unload functionality.
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