[Bug tui/28887] New: colored prompt length not calculated correctly

["seanga2 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

            Bug ID: 28887
           Summary: colored prompt length not calculated correctly
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tui
          Assignee: unassigned at sourceware dot org
          Reporter: seanga2 at gmail dot com
  Target Milestone: ---

When using gdb with a colored prompt such as

set prompt \033[31mgdb$ \033[0m

the length of the prompt will include the non-visible escape codes. This can be
demonstrated by entering a long command:

gdb$ some long command

and then pressing UP and HOME (or C-P and C-A). The cursor will be placed on
the space after "long," instead of on the s in "some", as expected.
Additionally, if one presses DOWN (C-N), "some long" will remain at the
beginning of the command. Despite this, the cursor is "logically" at the
beginning of the command, which can be seen by editing the command and
inspecting the history.

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