Iedit mode unpredictable in Haskell mode

[dschrempf]

Description :octocat:

Refactor symbol name in Haskell buffer (haskell layer) with iedit-mode.

Reproduction guide :beetle:

• Start Emacs
• Open a Haskell file.
• Move point on a symbol.
• SPC s e.
• Edit symbol (e.g., remove a letter with x).

Observed behaviour: :eyes: :broken_heart: Changes do not (always??, see screencast) get propagated to other symbols. Also, I only observed this bug when editing a file within a project. Outside a project, =iedit-mode= worked as expected! Please let me know how I can provide further information to narrow down the cause of this bug.

Expected behaviour: :heart: :smile: All symbols change.

System Info :computer:

• OS: gnu/linux
• Emacs: 26.1
• Spacemacs: 0.300.0
• Spacemacs branch: develop (rev. 4b195ddfc)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: helm
• Layers:

  (auto-completion better-defaults git gtags helm ibuffer multiple-cursors neotree ranger shell spell-checking semantic spacemacs-layouts version-control
               (c-c++ :variables c-c++-default-mode-for-headers 'c++-mode c-c++-enable-clang-support nil)
               emacs-lisp ess haskell html
               (javascript :variables tern-command
                           '("node" "~/.node_modules_global/bin/tern"))
               latex markdown nginx php python rust shell-scripts systemd vimscript yaml erc twitter mu4e my-org syntax-checking)

• System configuration features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 MODULES THREADS LIBSYSTEMD LCMS2

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