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There is a validation upon toggling line breakpoints from gutter, context menu and keyboard shortcut. However, this does not work when I try to enter the breakpoint through the "New Breakpoint" dialog. To reproduce, follow the steps in test case 34 of Line Breakpoints suite from the test specification here: http://wiki.netbeans.org/TS_72_JPDAdbg_DebuggingAndBreakpoints The step that says "Toggle line breakpoint on lines 24, 31, 37, 43, 46, 57, 64, 90, 248." cannot be done using "toggling", because there is always a message "A breakpoint cannot be set at this location." in the statusbar. However, those breakpoints can be added using the "New breakpoint" dialog. I would expect this validation to occur in this case as well and show a popup window saying that the breakpoint cannot be added. Also, the test specification should be modified accordingly.
P4 - nothing severe.