The minimap Qt Creator plugin lets the user use a "minimap" as scrollbar for text editors.
The minimap is only visible if is enabled, and text wrapping is disabled and if the line count of the file is less than the Line Count Threshold setting. If these criterias are not met an ordinary scrollbar is shown.
Larger textfiles tend to render a rather messy minimap. Therefore the setting Line Count Threshold exist for the user to customize when the minimap is to be shown or not.
You can edit the settings under Minimap tab in the Text Editor category. There are three settings available:
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Enabled
Uncheck this box to completely disable the minimap srcollbar
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Width
The width in pixels of the scrollbar.
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Line Count Threshold
The threshold where minimap scrollbar
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Scrollbar slider alpha value
The alpha value of the scrollbar slider