[Eclipse] Partial acceptance of Tabby suggestions should not dismiss the painted ghost text

[joaodinissf]

Please describe the feature you want

In Eclipse, partial acceptances should not dismiss the displayed inline suggestions.

Currently, after accepting a partial completion, the displayed inline suggestion is dismissed and fully recalculated.

Additional context

In VS Code, it is possible to accept completions partially without dismissing the painted ghost-text suggestion. This makes the UX much snappier.

Below are two videos comparing the behavior in Eclipse and VS Code. Note how much longer it takes to accept the same suggestion in Eclipse due to the dismissal of the ghost text.

eclipse-behavior.mp4

vscode-behavior.mp4

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