(mh-buffer-exists-p): Move inside mh-do-in-gnu-emacs since it isn't used outside of it. (mh-tool-bar-folder-buttons-init, mh-tool-bar-letter-buttons-init): Update load-path/image-load-path before setting buttons. This code used to be in mh-folder-mode/mh-letter-mode but this was the wrong place since mh-tool-bar-*-buttons-init can also be called when customizing the buttons. (mh-tool-bar-update): New function which updates tool-bar-map in all of the MH-E buffers after customizing the buttons (closes SF #1452718). (mh-tool-bar-folder-buttons-set, mh-tool-bar-letter-buttons-set): Call it (closes SF #1452718). * mh-folder.el (mh-folder-buttons-init-flag): Delete. Use mh-folder-tool-bar-map instead. (image-load-path): Delete. No longer used. (mh-folder-mode): Moved setting of image-load-path into mh-tool-bar-folder-buttons-init. * mh-letter.el (mh-letter-buttons-init-flag): Delete. Use mh-letter-tool-bar-map instead. (image-load-path): Delete. No longer used. (mh-letter-mode): Moved setting of image-load-path into mh-tool-bar-letter-buttons-init. * mh-seq.el (mh-narrow-to-seq, mh-widen): Use with-current-buffer instead of set-buffer.
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