Breakpoints Icons and Statuses
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Basics
When a breakpoint is set, the editor displays a breakpoint icon in the gutter area to the left of the affected source code. A breakpoint icon denotes status of a breakpoint, and provides useful information about its type, location, and action.
The icons serve as convenient shortcuts for managing breakpoints. Clicking an icon removes the breakpoint. Successive use of Alt - click on an icon toggles its state between enabled and disabled. The settings of a breakpoint are shown in a tooltip when a mouse pointer hovers over a breakpoint icon in the gutter area of the editor.

Breakpoint states and icons
The table below summarizes the possible breakpoint states:
When the button is pressed in the toolbar of the Debug tool window, all the breakpoints in a project are muted, and their icons become grey:
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