On-demand trigger for Description Window

[sesquialtera87]

Description
Currently, the completion description window of AutoComplete can only be set to either always visible or always hidden.
When always visible, it always opens even when the active auto-completion item contains no detailed documentation, causing unnecessary UI clutter. On the other hand, leaving it always disabled prevents users from seeing useful documentation when it is available.

Current Behavior

• Description window is permanently active or permanently disabled via global settings.
• When active, it pops up even if no description text is present for the currently selected completion item.

Expected / Desired Behavior

• An on-demand mode where the description window remains hidden by default.
• Users can press a configurable shortcut (e.g., Ctrl + Q / Cmd + J, similar to IntelliJ IDEA / Eclipse) to toggle or bring up the description window for the currently selected item in the completion list.
• If no description is available for the active item, pressing the shortcut should either do nothing or display an indicator (e.g. "No documentation available").

Use Case / Context

• Improves editor UX by keeping the code view clean while still allowing quick access to documentation when requested.

[bobbylight]

@sesquialtera87 is the shortcut standardized, to any degree? What should the default be?