(doc-view-conversion-buffer): Give it an internal name.
Demote it to plain defvar. (doc-view-conversion-refresh-interval): Reduce interval. (doc-view-goto-page): Allow moving to pages not yet rendered. (doc-view-goto-page): Construct a file name rather than extracting it from doc-view-current-files. (doc-view-kill-proc): Ignore errors from kill-process. (doc-view-pdf/ps->png-sentinel): Die gracefully if the buffer is dead. (doc-view-insert-image): Use appropriate text if the page hasn't been rendered yet. Adjust scrolling so the text is displayed. (doc-view-display): Detect not just that a page is available, but also that it wasn't available before, to avoid refreshing all pages repeatedly. (doc-view-mode): Make doc-view-cache-directory if needed.
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