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Previously, all visibility in show buffers for headers, message bodies, and washed text was specified by generating one or more symbols for each region and creating overlays with their 'invisible property set to carefully crafted combinations of these symbols. Visibility was controlled not by modifying the overlays directly, but by adding and removing the generated symbols from a gigantic buffer invisibilty spec. This has myriad negative consequences. It's slow because Emacs' display engine has to traverse the buffer invisibility list for every overlay and, since every overlay has its own symbol, this makes rendering O(N^2) in the number of overlays. It composes poorly because symbol-type 'invisible properties are taken from the highest priority overlay over a given character (which is often ambiguous!), rather than being gathered from all overlays over a character. As a result, we have to include symbols related to message hiding in the wash code lest the wash overlays un-hide parts of hidden messages. It also requires various workarounds for isearch to properly open overlays, to set up buffer-invisibility-spec for remove-from-invisibility-spec to work right, and to explicitly refresh the display after updating the buffer invisibility spec. None of this is necessary. This patch converts show and wash to use simple boolean 'invisible properties and to not use the buffer invisibility spec. Rather than adding and removing generated symbols from the invisibility spec, the code now directly toggles the 'invisible property of the appropriate overlay. This speeds up rendering because the display engine only has to check the boolean values of the overlays over a character. It composes nicely because text will be invisible if *any* overlay over it has 'invisible t, which means we can overlap invisibility overlays with abandon. We no longer need any of the workarounds mentioned above. And it fixes a minor bug for free: now, when isearch opens a washed region, the button text will update to say "Click/Enter to hide" rather than remaining unchanged. |
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| coolj.el | ||
| Makefile | ||
| Makefile.local | ||
| notmuch-address.el | ||
| notmuch-crypto.el | ||
| notmuch-hello.el | ||
| notmuch-lib.el | ||
| notmuch-logo.png | ||
| notmuch-maildir-fcc.el | ||
| notmuch-message.el | ||
| notmuch-mua.el | ||
| notmuch-print.el | ||
| notmuch-query.el | ||
| notmuch-show.el | ||
| notmuch-tag.el | ||
| notmuch-wash.el | ||
| notmuch.el | ||
